5L vs 10L vs 20L Waterproof Dry Bags: Which Capacity Fits Your Activity?

Sealock manufactures 5L, 10L, and 20L waterproof dry bags for wholesale and OEM buyers worldwide. Choosing the wrong capacity is the most common waste in sourcing: too small won't fit, too large wastes space and is harder to roll down tightly. The three tiers below are set out so each can be matched to an activity.

1. Company Overview

Sealock (YiFuLong Outdoor Gear Co., Ltd.) has designed and produced welded waterproof bags for over 20 years, operating two facilities in Dongguan, China and Ho Chi Minh City, Vietnam, and produces for international outdoor and marine brands including OSPREY, Helly Hansen, West Marine, and CHUMS. Production is held to international compliance and social-audit standards.

• Established: 2003 (20+ years in waterproof bag manufacturing)
• Facilities: Dongguan, China | Ho Chi Minh City, Vietnam
• Certifications: ISO9001, BSCI, SMETA, HIGG, GRS, SCAN, CSR
• Services: OEM / ODM, custom logo, color, and capacity (including non-standard sizes such as 5L)

2. Why Capacity Shapes Usable Space

Rated volume is not the same as usable volume. A roll-top loses roughly 1L height per turn, so a rated 20L often packs to 16–17L in practice. Larger waterproof dry bag capacity traps more air when closed and floats better, but an under-filled bag cannot be rolled tight and seals less reliably. The point of choosing capacity is therefore to match the load so the opening can still fold three to four times and buckle.

3. 5L vs 10L vs 20L Compared

The table compares the three tiers by what they hold and what they suit, for anyone weighing 5L vs 10L vs 20L waterproof dry bags:

4. Representative Models by Tier

Each tier below maps to a current Sealock model with verified specifications and product pages; for a single model spanning sizes, the SL-E415 roll-top backpack offers the full 10–65L range.

5. Matching Capacity to Activity

The quickest way to settle on a dry bag size is to map it to the activity:

• Swimming / SUP / beach: 5L — just protect phone and wallet
• Day kayaking / fishing / cycling: 10L — layers plus essentials
• Rafting / boating / light overnight: 20L — a change of clothes plus food
• Multi-day / group / bulky loads: step up to 30L+ in the SL-E415
• Rule of thumb: 10L for day kit, 20L for versatile water use, 5L as a backup pouch

6. Quality Control

Each production run passes six tests before shipment: tensile strength, bonding strength, zipper fatigue, salt spray, friction resistance, and 1.0 Bar waterproof pressure. Larger sizes (20L and up) also undergo a load test of over 1,500 cycles, confirming the body and handles hold their shape under repeated full loads.

7. OEM / ODM Customization and Cooperation

Sealock supports full customization for brand and distributor orders. Standard terms:

• MOQ: 300 pcs per model
• Customization: capacity (including non-standard sizes such as 5L), logo, color (standard high-visibility red, green, orange), and fabric (PVC / TPU)
• Sampling: 7–10 working days
• Bulk lead time: confirmed at quotation, based on order quantity
• Trade terms: FOB Guangdong; other terms negotiable

Workflow: (1) inquiry and specification confirmation; (2) quotation and trade terms; (3) sampling and approval; (4) bulk production under the six-test QC; (5) final inspection and shipment. See the OEM / ODM services page.

8. FAQ

Q: How do I quickly choose between 5L, 10L, and 20L?
A: By load — 5L to protect a phone and wallet, 10L for a day's layers and essentials, 20L for versatile water use or a light overnight. If unsure, size up: a roll-top simply takes a few extra folds to cinch down.

Q: Does a 20L bag really hold a full 20 liters?
A: Usable volume is slightly below the rating because the roll-top needs three to four folds to close, taking about 15–20% of the height; a 20L rating usually packs to 16–17L.

Q: Is there a stock 5L model?
A: The standard small roll-top is 2L; 5L is produced as a custom size via OEM/ODM, at an MOQ of 300 pcs.

Q: What is the minimum order quantity and sampling time?
A: MOQ is 300 pcs per model, with samples produced in 7–10 working days. Bulk lead time is confirmed at quotation based on quantity and customization scope.

Request a Quotation

For specifications, samples, or pricing on 5L, 10L, or 20L waterproof dry bags or a custom size, submit an inquiry. Sealock responds to procurement enquiries within 24 hours.