Osprey Ultralight 20L Waterproof Dry Sack — Black, Roll-Top Rectangular, Packable 0.13 lb

The Osprey Ultralight 20L Waterproof Dry Sack is a lightweight, rectangular roll-top dry bag that keeps a 20-liter load organized and protected from spray and rain.

Designed to fit neatly inside a backpack or luggage, this 20-liter version of Osprey's Ultralight Dry Sack family combines a low weight with a space-efficient rectangular profile. It uses a roll-top closure and waterproof-coated fabric with taped seams to block water intrusion in everyday wet conditions. Offered alongside other volumes and colors, it also simplifies color-coded organization for trips, commutes, or outdoor adventures.

How does the roll-top closure keep gear dry?

The roll-top closure compresses the bag opening into a watertight fold and then secures it, shedding rain and spray while reducing internal air volume for a snug pack fit. While engineered to resist water from splashes and heavy rain (IPX5), it is not intended for full submersion.

• Roll-top seals out spray and driving rain.
• Taped seams and waterproof coating limit seepage.
• IPX5 rating: water-resistant, not submersible.

Will the rectangular shape improve packing inside a backpack?

The rectangular cross-section is engineered to sit flat against other items and the pack back panel, using space more efficiently than round dry sacks. That shape reduces wasted voids and makes layering or stacking multiple sacks simpler when organizing gear.

• Flat sides align with pack interiors for stable placement.
• Helps stack and separate items for quick access.
• Available in multiple sizes for modular packing setups.

How lightweight and compact is the 20L model?

Weighing just 0.13 lb and sized at 16.1 x 10.2 x 7.9 inches, the 20L Ultralight Dry Sack is easy to carry and compresses down when not fully loaded. The low mass avoids adding unnecessary weight to daypacks or travel luggage while still holding a substantial volume of clothing or gear.

• Item weight: 0.13 lb for minimal carry burden.
• Item dimensions: 16.1H x 10.2W x 7.9D inches for a roomy 20 L capacity.
• Packable when empty for space-saving storage.

What attachment or handling features does it include?

The dry sack includes a reinforced D-ring for hanging to dry, clipping to a pack exterior, or tethering inside a larger bag. The simple hardware keeps the design clean while providing practical options for storage, transport, and quick access on the trail or at camp.

• D-ring for hanging, securing, or attaching to straps.
• Durable fabric finish and taped seams for everyday use.
• Color options for easy organization and gear separation.

Who is this for? Travelers, day hikers, paddlers, and commuters who need a low-weight, space-efficient dry storage solution will find the Osprey Ultralight 20L Dry Sack practical. It suits anyone who wants to keep clothing, electronics, or essentials protected from rain and spray inside a backpack or suitcase, and who values neat packing thanks to the rectangular profile and color-coded sizing options.