Perfect dry compression storage to keep gear reliably dry and compact inside a backpack or bike bag. Made from bluesign APPROVED ultra lightweight Ultra-Sil 30D Cordura® nylon with an EVAC fabric air-permeable base. Squeeze air out while keeping the contents dry, without the need for an old-fashioned purge valve - compression straps make it easy to evenly compress soft items. Simple, extremely light and reliable - the perfect dry compression solution for internal use.