Catalog requests cannot be priced. A usable first email names the bag, the size, the cloth or the target price, the quantity, and where it ships.

5L, 10L, 20L and 30L are different products, not one bag scaled up. Start with the size your customer will reorder.

On a roll-top, the top of the bag disappears when it is closed. Where you put the logo matters more than the print method.

PVC still carries most wholesale dry-bag programs. TPU earns its cost when hand feel and cold weather matter. The weld still decides whether either one leaks.

A Dry Bag Usually Leaks at the Mouth, Not Through the Fabric
The leak emails we get are rarely about a hole in the middle of the cloth. Someone packed a phone and a spare layer, trusted the roll, and opened a wet bag at the end of the day. The panel is usually intact. Water came in at the mouth, or along a weld that looked sealed on the sample table and then opened after the bag sat folded in a carton.
A roll-top stays dry because the opening is folded down on itself. Three folds, if the skirt is long enough, then the buckle. Each fold is a wall the water has to climb. Two folds feel closed when the bag is empty on a desk. Once it is full, the top is under tension and two folds often are not enough. The opposite problem shows up on stiff cloth: the skirt is long, but the buyer cannot get the buckle across without a wrestle, so they stop early and call that shut.

Buyers who are new to OEM often expect a catalog purchase flow: pick a model, send a logo, wait for shipment. Custom waterproof bags rarely move that cleanly. Here is a realistic process so both sides waste less time.

Customers rarely complain on day one. They complain after the third river weekend, the second rainy commute, or the first time they toss a phone and jacket into the main compartment and trust the label that said “waterproof.”
If you buy or brand waterproof backpacks, it helps to know where leaks usually start. That knowledge makes supplier conversations much sharper.

Exact capacity, not just “medium”
5L, 10L, 20L, and 30L bags look similar in photos and feel completely different in use. Confirm internal volume and finished dimensions. If your customer base is kayak users, oversized bags can become a complaint. If you sell travel kits, undersized bags get returned.

PVC vs TPU Dry Bags: What Wholesale Buyers Should Decide First
When buyers ask for a “waterproof dry bag,” they often mean one product. Factories hear two different jobs: PVC and TPU. Both can keep gear dry. They are not interchangeable if you care about margin, brand positioning, and return rates.

How to Choose a Waterproof Dry Bag Manufacturer Without Getting Burned A lot of buyers start with photos. Nice colors, clean stitching, a roll-top that looks tight in a studio shot. Then the first bulk shipment arrives, and the bags behave differently once they hit real water, real heat, and real warehouse handling. If you sell outdoor gear, kayak kits, or private-label travel bags, the manufacturer you pick matters more than the catalog design. Here is a practical way to judge a waterproof dry bag factory before you lock in an order.

Discover the ultimate in outdoor convenience with Camping Waterproof PVC 500D Dry Bag Backpacks, designed for adventurous spirits seeking durability and style in their outdoor excursions.

Explore the best extra large waterproof neoprene wheeled dry army military TPU sport duffel bags, designed for versatile travel and active lifestyles. Perfect for men and women, these bags are ideal for gym enthusiasts and outdoor adventurers.