Sea to Summit Ultra-SIL Dry Bag — 3L Spicy Orange Waterproof, Ultracompact 30D Ripstop

Sea to Summit’s Ultra-SIL 3L Dry Bag is an ultralight, waterproof roll-top sack designed to keep gear dry and organized on fast-and-light adventures.

Lightweight and compact, this 3-liter dry bag balances minimal weight with practical features: bluesign-approved 30D Ultra-Sil Cordura ripstop nylon, a secure Hypalon roll-top closure, taped seams, and a translucent fabric that helps you spot contents quickly. It was engineered for backpackers, bikepackers, and travelers who need dependable dry storage without added bulk.

How waterproof and durable is the Ultra-SIL 3L?

The fabric carries a 2,000 mm waterhead rating and the seams are double-stitched and tape-sealed for robust resistance to moisture. Reinforced stitching at stress points and ripstop construction reduce the chance of tears while the roll-top closure keeps water out during routine exposure.

• 2,000 mm waterhead waterproof rating
• Bluesign-approved 30D Ultra-Sil Cordura ripstop nylon
• Double-stitched, tape-sealed seams
• Hypalon roll-top closure for secure sealing

How light and compact is this dry sack for backpacking or bikepacking?

At just 0.07 pounds and with a low-profile oval base, the Ultra-SIL 3L minimizes pack weight and takes up little room inside a pack. The streamlined shape resists rolling, making it easy to stack or stow beside other gear.

• Weighs 0.07 pounds (ultra-light for a 3L capacity)
• Measures 6.7 x 5.5 x 8.1 inches when closed
• Oval base keeps the bag stable in pack or pannier
• Translucent fabric helps identify contents without opening

Can I repair or replace parts in the field?

Sea to Summit built the bag with practical field-serviceability in mind. The patent-pending repair buckle can be swapped out quickly, and the simple roll-top design keeps repairs straightforward if needed on the trail.

• Field-replaceable repair buckle for fast fixes
• Minimal hardware reduces failure points
• Repair-friendly seams and stress-point reinforcement

What fits inside and how should I use it for packing?

The 3-liter volume is ideal for electronics, first-aid kits, clothing layers, cooking gear, or other items you want protected from moisture. Roll the top three times for rated capacity and to maintain a compact shape; use multiple sizes to organize different systems in your pack.

• 3 L capacity fits a phone, small camera, socks, or compact cook set
• Roll closure rolled three times to achieve rated volume
• Translucent material simplifies content identification on the move
• Works well grouped with larger dry bags for modular packing

Who is this for: The Sea to Summit Ultra-SIL 3L is aimed at ultralight backpackers, bikepackers, minimalist travelers, and anyone who needs dependable waterproof storage without adding bulk. It’s a sensible choice for people who prioritize low weight, easy repair, and clear visibility of packed items during multi-day trips.