A durable sleeve to safely store your hydration reservoir. With hook on the back, and loop on the front, the sleeve can attach within packs like the U.C. Pack while still allowing for additional customization. Padding within provides protection and insulation for your reservoir. 100% Polyester Imported Machine Wash Sized to fit most popular 3 liter hydradion reservoirs Padded for additional protection and insulation Lined for water resistance Hook backed and loop faced for attaching to loop fields without limiting additional hook and loop accessories Large open-top compartment allows for easy entry and removal with a secure hook and loop retention strap 16" H x 8" W x 1" D