Osprey Ultralight 3L Waterproof Dry Sack — Blue, Rectangular Roll-Top, Ultra-Light

Built for travelers, day hikers, and commuters who want a lightweight, space-efficient way to separate damp or valuable items, this 3-liter dry sack combines a narrow rectangular profile with waterproof-coated fabric and taped seams. Its slim shape fits neatly into backpack frames, luggage corners, or bike panniers so you don’t waste space. Available in multiple colors and volumes, it also makes quick visual organization easy.

How does this dry sack keep gear dry without taking up much room?

The Ultralight 3L uses a roll-top closure and waterproof coating plus sealed seams to block spray and rain. Its rectangular cross-section packs more efficiently than round sacks, so you can slide it into corners and compressible pockets without wasted volume.

• Roll-top waterproof closure for a tight seal
• Waterproof-coated fabric and taped seams to resist water ingress
• Rectangular shape for efficient use of pack space
• IPX5 rating: water-resistant to splashes and spray (non-submersible)

What size items fit inside the 3-liter model?

The 3L size suits small essentials such as a lightweight jacket, food, electronics, or toiletries. The compact footprint is ideal for stashing items you want isolated from wet gear or for keeping valuables protected inside a larger bag.

• Item dimensions: 8.7 H x 5.9 W x 5.5 D inches
• Holds small layers, a power bank and cables, snacks, or first-aid items
• Slim shape fits vertical or horizontal pack compartments

How durable and versatile is this packable dry sack for outdoor use?

Though featherweight at 0.06 lb, the Ultralight dry sack uses coated fabric and reinforced seams for reliable short-term protection in wet conditions. A D-ring lets you clip it to the outside of a pack to dry, attach to gear, or keep it accessible during day trips.

• Ultra-light construction balances weight and durability
• D-ring for hanging to dry or clipping to straps
• Designed for organizing within packs rather than long-term submersion

Can I color-code with other sizes and uses?

Yes—Osprey offers this design in several capacities and colors so you can assign each color a role (e.g., blue for electronics, red for toiletries). Matching shapes across sizes keeps packed contents tidy and predictable on every trip.

• Available in multiple volumes and colors for organization
• Consistent rectangular profile across sizes for neat stacking
• Easy visual system for separating wet, dirty, or valuable items

Who is this for? The Ultralight 3L Waterproof Dry Sack is best for anyone needing a low-weight, space-conscious way to protect and separate small items inside a backpack, suitcase, or bike bag—ideal for minimalist travelers, commuters, and outdoor enthusiasts who prioritize efficient packing and quick access. It is not intended for continuous underwater use but excels at keeping gear dry from rain, splashes, and accidental exposure.