Sea to Summit · PRODUCT RESEARCH
Sea to Summit Ultra-Sil Dry Bag 13L
Protected dry storage inside a backpack
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Where it makes sense
The 13L Ultra-Sil is an internal organizer for dry clothing or compatible compact sleep gear carried inside a backpack or duffel. Its low listed weight makes sense when a protected outer bag handles abrasion and the contents need their own moisture barrier. The semi-translucent fabric can help distinguish pouches without repeatedly opening them. Select the volume by packing your actual contents, leaving room for the specified closure, rather than assuming every sleeping bag fits. This is the more specialized lightweight choice in our dry-bag pair: the manufacturer places it inside luggage and advises other fabrics for water sports or general external exposure. Treat it accordingly and inspect it before each trip.
The tradeoff
Thin internal-storage fabric is unsuitable for routine exposed abrasion or water sports
Documented specifications
| Capacity | 13 L |
| Weight | 47 g |
| Fabric | 30D nylon |
| Rolled height | 43.3 cm |
| Base | 19.6 × 22 cm |
Sources & further reading
Manufacturer product specifications ↗Manufacturer specifications and guidance checked September 2026. Model generations and included accessories can change; confirm the exact version before ordering.
