A reliable dry bag factory owns its welding, cutting and testing in-house, keeps material stock on the floor, and can send a pre-production sample for approval. Before you order, confirm the machines, the sample policy and the lead time for your exact size and material.
People searching for "dry bag factory" usually want a direct, practical answer - and this page delivers one. This guide walks through how to evaluate a dry bag factory - the checks that matter, the numbers to verify, and the questions that separate a dependable production partner from a middleman. It covers MOQ, lead time, sampling, testing, materials and export terms so you can source with confidence.
Machines you should see
RF welding for PVC, hot-air welding for TPU, a cutting table, a seam-taping line and a leak-testing tank are the core of a dry bag factory. If any of these are missing, the factory is buying finished bags elsewhere and marking them up.
Why in-house welding matters
Waterproofing quality is set at the weld, and outsourced welding hides defects and delays fixes. A factory that welds in-house can adjust temperature, pressure and time on the same day and re-test immediately.
Confirming before production
Request a photo or live video of the floor, a sample made to your spec, and a written lead time. A serious factory welcomes a video call through the workshop; a trader usually avoids showing you the line.
Waterproof testing and quality control
Waterproofing is the product's core promise, so ask exactly how the factory tests it. Reputable dry bag factory operations use submersion jigs, inflation-and-submersion to reveal bubbles, and seam pull tests, and they can share test reports for IPX6, IPX7 or IPX8 conditions.
In production, every batch should be sampled for leaks, not just the prototypes. Confirm the sampling plan - typically AQL-based - and whether the factory performs a 100% visual and closure check before packing. Documented testing is the difference between a dry bag and a bag that looks dry.
Export, packaging and logistics
Most dry bag factory production is exported from Quanzhou or Xiamen ports by sea, with FOB, CIF or DDP terms. Sea freight to the US or Europe takes 3-6 weeks, while air freight takes 5-10 days for urgent re-orders or launches.
Packaging completes the product: poly bags, hangtags, retail boxes, EAN/UPC barcodes and insert cards can all be customized. Confirm packaging weight and carton dimensions early, because they affect freight cost and your retail presentation equally.
Working with a dedicated project manager
A good dry bag factory supplier assigns one person to your account who tracks the spec, sample, production and shipping. That single point of contact prevents the telephone-game mistakes that happen when instructions pass through several people.
Confirm communication cadence up front - weekly updates, photo reports from production, and approval checkpoints. Clear communication is often the difference between an on-time order and a costly delay.
Sampling: why it protects your order
A pre-production sample is a single bag made to your final specification before bulk begins. It lets you confirm material, color, closure, printing placement, hardware and waterproofing before hundreds or thousands of units are produced.
Never skip the sample on a dry bag factory order, even if the factory has an existing design. The sample fee is typically credited back against the bulk order, so it effectively costs nothing once you proceed - and it can save you from an entire container of a wrong specification.
MOQ and lead time explained
MOQ for a dry bag factory usually starts at 500 pieces per design and color, because material rolls and production setup are priced by volume. OEM designs with new tooling often start around 500 pieces or more, while ODM stock programs can sometimes begin lower.
Lead time splits into sampling and bulk. A pre-production sample typically takes 6--10 day, and bulk production takes 35-50 days after approval. Add 3-6 weeks for sea freight or 5-10 days for air freight, and build buffer into your calendar for printing approval.
Capacity, quality and how to verify both
Capacity claims only matter when they are dated and evidenced. Ask for the number of production lines, monthly output and a recent third-party audit such as SGS. A stated figure without a source or verification date is marketing, not capacity.
Quality systems are equally important. Confirm there is incoming material inspection, in-line QC and a final AQL inspection, and that every dry bag factory order is leak-tested before packing. A supplier that can describe its QC gates is far more trustworthy than one that only promises good quality.
| Area | Role |
|---|---|
| Cutting | Panels from roll stock |
| Welding | RF / hot-air seam sealing |
| Testing | Leak / IPX checks |
| QC | AQL inspection |
| Step | What to do | Why it matters |
|---|---|---|
| 1. Shortlist | Pick 3-5 dry-bag specialists | Filters out general bag makers |
| 2. Verify | Request audit report or live tour | Confirms capacity is real |
| 3. Spec | Fix material, size, closure, printing | Makes quotes comparable |
| 4. Sample | Order a pre-production sample | Locks the final spec |
| 5. Test | Confirm leak/IPX test method | Protects the waterproof promise |
| 6. Order | Agree MOQ, lead time, QC, terms | Prevents disputes later |
| Criterion | What to verify | Red flag |
|---|---|---|
| Specialization | Dry bags are a core product line | Only generic fashion bags |
| Welding | RF / high-frequency machines on site | Only sewing machines |
| Capacity | Dated SGS or audit report | Unverified big numbers |
| Testing | Submersion / inflation leak tests | No test method described |
| Samples | Pre-production sample offered | No sample or sample for sale only |
| Compliance | REACH / RoHS documents available | Verbal assurances only |
| Cost driver | Typical share | Notes |
|---|---|---|
| Material | 40-60% | Film is the largest cost |
| Labor | 15-25% | Welding and assembly |
| Hardware | 5-15% | Buckles, rings, zippers |
| Printing | 3-10% | Depends on method |
| Packaging | 2-8% | Poly bag to retail box |
| Term | What it means |
|---|---|
| FOB | Buyer pays freight from port |
| CIF | Cost, insurance and freight included |
| DDP | Seller handles duties and delivery |
Bulk lead time broken into stages
Once the golden sample is signed and the deposit is paid, bulk production runs 35-50 days depending on complexity. The first 7-10 days are material sourcing and cutting. The next 15-20 days are high-frequency welding, seam taping and hardware fitting. The final 7-10 days are printing, QC, packing and cartoning.
Sea freight from Xiamen or Shenzhen to the US West Coast adds 14-20 days door-to-door with DDP, to Northern Europe 28-35 days, and to Australia 18-25 days. Express courier (DHL/FedEx) for a 300-500 piece sample shipment adds 5-8 days but at far higher cost. Plan your launch calendar backwards from these numbers, not from the factory's quoted 35 days.
Peak season (August-October for holiday inventory) can push welding lines 10-14 days longer. If you ship in Q4, place the deposit by mid-August at the latest.
Packaging, carton dimensions and landed cost math
A single 20L roll-top dry bag packs flat into a polybag at roughly 28 x 22 x 4 cm and weighs 380-480 g depending on fabric thickness. A standard export carton holds 40-60 pieces and measures about 55 x 45 x 40 cm at 18-22 kg gross. These numbers drive the sea freight quote.
Landed cost = unit price + inland trucking + export customs + ocean freight + insurance + import duty + DDP clearance + last-mile delivery. For a US importer at a 5,000-piece order this typically adds USD 1.8-3.2 per bag on top of the factory price. For EU importers REACH testing and duty add another USD 1.0-1.8.
Always ask the factory for a CIF quote to your nearest port and a DDP quote to your warehouse side by side. The DDP number is what your accountant actually cares about, and it is easy to underestimate if you only compare FOB prices.
Why a tech pack matters more than a price quote
A price quote without a signed tech pack is a guess. A proper tech pack includes a flat drawing with dimensions in millimetres, fabric specification (weight g/m2, thickness mm, coating type), closure type, hardware SKUs, logo placement with PMS colours, packing details and the approved golden sample reference.
Without this, the factory will default to its cheapest existing construction, and you will discover at sample stage that the fabric is thinner, the strap is shorter and the welds are narrower than you imagined. The rework rounds that follow cost more than the tech pack ever would have.
If you do not have an in-house designer, most factories including the one behind this site will draft the tech pack for you based on a reference bag or a sketch. Chargeable USD 80-200 per design, credited back against the bulk order.
MOQ tiers and how quantity moves unit price
OEM dry bag programs almost always start at MOQ 500 pieces per design per colour, because the factory has to open a fresh roll of fabric, cut a fresh pattern set and reset the welding line for that one SKU. Below 500 units the setup cost is spread too thinly and the per-piece price jumps sharply.
At 500 pieces you are at the entry OEM price. At 1,000 pieces most factories will drop the unit price by 8-14% because cutting, welding and packing all run faster once the line is set. At 3,000-5,000 pieces the discount widens to 15-22%, and above 5,000 pieces material purchasing itself becomes cheaper because the mill sells the roll at a bulk rate. Ask the supplier for a tiered price table at 500 / 1,000 / 3,000 / 5,000 so you can model your own break-even.
A common mistake is locking a 500-piece order when a 1,000-piece order would have landed the unit price low enough to fund a marketing campaign. Work backwards from your sell-through forecast, not from the MOQ itself.
Sampling workflow and realistic turnaround
A pre-production sample for a custom dry bag takes 6-10 working days after the tech pack is approved. The sample goes through the same welding table, the same heat-seal parameters and the same hardware as the bulk run, so it is representative of what you will receive.
Expect to do two to three sample rounds. Round one confirms dimensions, fabric feel and logo placement. Round two adjusts closure, strap length and any custom pockets. Round three is the signed-off golden sample that the bulk production is measured against. Each round adds 4-7 days, so budget 3-4 weeks end to end if you want a fully custom bag.
If you are starting from an ODM stock program, a customised sample (your logo on an existing shape) can ship in 3-5 days. This is the fastest way to test a market before committing to full OEM. For in-house manufacturing capacity, tooling and export documentation, see our affiliated manufacturer.
People also ask
What does waterproof mean on a dry bag?
Waterproof means the bag keeps water out under stated conditions. On a dry bag it is usually expressed as an IPX rating such as IPX7 or IPX8, which specifies immersion depth and time.
What is the difference between waterproof and water resistant?
Waterproof means it keeps water out under submersion or jets; water resistant means it resists light rain and splashes but will leak under pressure or immersion.
What is the HS code for dry bags?
Dry bags generally classify under travel goods or bags headings such as 4202. Confirm the exact 10-digit code with your freight forwarder and the destination customs authority.
How much does a custom dry bag cost?
A simple PVC dry bag can cost a few dollars per unit at volume, while a premium TPU bag with custom hardware and printing costs more. Unit price depends on material, size, closure and quantity.
What certifications should I ask a dry bag supplier for?
REACH and RoHS material compliance for the EU, plus a third-party audit such as SGS. Ask for documents rather than verbal assurances, and check the test date.
What does IPX8 mean on a dry bag?
IPX8 means the bag survives continuous immersion beyond 1 meter under manufacturer-specified conditions. The depth and duration are only meaningful if stated.
What is RoHS for dry bags?
RoHS restricts hazardous substances in electrical and electronic products. It matters mainly for dry bags with electronic or metal components.
What are the parts of a dry bag?
Body fabric, roll-top or zipper closure, buckle, D-rings or attachment points, straps or handles, and optional purge valve or window.
Key takeaways
- Choose dry bag factory by fixing the activity, size, material and closure before comparing options.
- Verify waterproofing with a stated IPX rating and a real test method, not a label.
- For bulk orders, confirm MOQ, lead time and a pre-production sample before committing.
- Match material to conditions: TPU for cold and UV, PVC for abrasion, coated nylon for weight.
- A physical pre-production sample is the only reliable way to lock material, color and printing.
- Store dry bags loose and shaded, and re-test the seal before trusting them with electronics.
Related guides
- What is a dry bag?
- Dry bag materials: TPU vs PVC vs nylon
- IPX / IP68 waterproof ratings
- Types of dry bags
- OEM dry bags
Step by step
- Shortlist three to five dry bag factory specialists rather than general bag makers.
- Request a dated audit report or a live factory tour to verify capacity.
- Fix your full specification - material, size, closure, printing and packaging.
- Order a pre-production sample and approve it before bulk begins.
- Confirm waterproof testing, MOQ, lead time, payment terms and the HS code.
- Agree QC standards and a pre-shipment inspection before production starts.
Specification checklist
- Fix the specification first - material, size, closure, printing and packaging - so quotes are comparable.
- Verify waterproofing with a stated IPX rating and a real test method, and confirm the batch sampling plan.
- Order a pre-production sample and approve it before bulk production begins.
- Confirm MOQ, lead time, payment terms and the correct HS code before you commit.
- Match the material to the conditions: TPU for cold and UV, PVC for abrasion, coated nylon for weight.
- Ask for a dated test report and a pre-shipment inspection (AQL) for waterproofing and seams.
- Keep the most valuable items in an inner pouch as a second layer of protection.
- Rinse, dry and store the bag correctly to extend its lifespan season after season.
Bottom line
The bottom line is that a dependable dry bag manufacturer is found, not stumbled upon. Verify specialization, capacity and testing with dated evidence, run a pre-production sample, and fix the specification before you compare quotes. A little diligence up front prevents an entire container of a wrong specification later. For "dry bag factory", this is the summary that matters most.
Frequently Asked Questions
Q1. What does waterproof mean on a dry bag?
Waterproof means the bag keeps water out under stated conditions. On a dry bag it is usually expressed as an IPX rating such as IPX7 or IPX8, which specifies immersion depth and time.
Q2. What is the difference between waterproof and water resistant?
Waterproof means it keeps water out under submersion or jets; water resistant means it resists light rain and splashes but will leak under pressure or immersion.
Q3. What is the HS code for dry bags?
Dry bags generally classify under travel goods or bags headings such as 4202. Confirm the exact 10-digit code with your freight forwarder and the destination customs authority.
Q4. How much does a custom dry bag cost?
A simple PVC dry bag can cost a few dollars per unit at volume, while a premium TPU bag with custom hardware and printing costs more. Unit price depends on material, size, closure and quantity.
Q5. What certifications should I ask a dry bag supplier for?
REACH and RoHS material compliance for the EU, plus a third-party audit such as SGS. Ask for documents rather than verbal assurances, and check the test date.
Q6. What does IPX8 mean on a dry bag?
IPX8 means the bag survives continuous immersion beyond 1 meter under manufacturer-specified conditions. The depth and duration are only meaningful if stated.
Q7. What is RoHS for dry bags?
RoHS restricts hazardous substances in electrical and electronic products. It matters mainly for dry bags with electronic or metal components.
Q8. What are the parts of a dry bag?
Body fabric, roll-top or zipper closure, buckle, D-rings or attachment points, straps or handles, and optional purge valve or window.
Q9. How do you test a watertight zipper?
A watertight zipper test closes the zipper and applies water pressure or submersion while checking for leaks along the teeth and slider.
Q10. What printing methods are used on dry bags?
Screen printing, heat transfer, woven labels and embossed or debossed hardware. The best method depends on the material and the logo detail.
Q11. What is the difference between IP67 and IP68?
IP67 survives 30 minutes at 1 meter. IP68 survives beyond 1 meter or longer immersion, but the exact depth and time depend on the manufacturer's spec.
Q12. Can a dry bag factory help with design?
Yes. ODM factories offer proven designs you can customize, and many provide design, sampling and packaging support for brands without an in-house designer.
Q13. What is FOB, CIF and DDP?
FOB means the buyer pays freight from the port; CIF includes cost, insurance and freight; DDP means the seller handles duties and delivery to the door.
Q14. Can I start with ODM and switch to OEM later?
Yes. Many brands validate a niche with ODM dry bags, then commission OEM designs to differentiate once they scale. Choose a factory that supports both.
Q15. How do I import dry bags from China?
Choose a specialized factory, confirm MOQ and lead time, order a pre-production sample, then arrange freight with FOB, CIF or DDP terms and confirm the correct HS code for customs.
Q16. What are the different types of dry bags?
Roll-top, zipper, backpack, tote, phone, floating, waist pack, duffel and pouch styles, each built for a different activity and access need.
Q17. Do I need a tech pack for OEM dry bags?
Not strictly. A clear drawing, reference sample, target material, dimensions and closure type are enough for a factory to quote and sample, though a tech pack improves accuracy.
Q18. What is the difference between IP68 and IPX8?
IP68 includes dust protection (6); IPX8 has no dust rating (X). For water protection the 8 is the same class of test.
Q19. Does dry bag material affect waterproofing?
The material supplies the waterproof barrier, but the closure and seams decide real-world waterproofing. A good film still leaks if seams or closures fail.
Q20. How do I clean a dry bag?
Rinse with fresh water, wipe with mild soap, and air-dry fully before storing. Avoid harsh solvents and keep zipper tracks clean of sand.