Osprey Ultralight Dry Sack 35 An efficient packing solution, the 35-litre Ultralight Dry Sack keeps your gear organised and protected within your pack or travel luggage with a rectangular shape for a better fit. Available in five different volumes and four colours, it's easy to colour-code your organisation too. Osprey Ultralight Dry Sack 35 Features: Roll-top waterproof closure Waterproof-coated fabric and seams Rectangular shape for efficient packing Meets IPX5, waterproof non-submersible D-ring for drying or attaching Build your own packing system Part of a coordinated system for optimised packing. Customise your experience by adding on smart packing and organisation accessories that meet your exact needs. Osprey accessories innovation All of our accessories have been overhauled to offer better organisation, operation, comfort and reduced environmental impact. Sustainable design Bluesign approved main body fabrics. Grs-certified 100% recycled main body fabrics. All dwr treatments made without pfas.