18 liter, main compartment with drawstring cinch closure. - 1 liter, top hanging pocket with zippered access and internal webbing loop. - Dual poly mesh side pockets hold 1000 ml bottles (bottles not included). - Pack stuffs into its top hanging pocket for simple storage. - Front panel bungee cord for quickly stashing extra layers. - Webbing grab handle. - Internal hydration reservoir clip and exit port for reservoir tube (reservoir not included). - Hose management shoulder strap webbing loops. - Capacity - 100 cubic inches. - Weight: 0.55 lbs. Body Dimensions: 18.0" x 11.0" x 8.0" - Nylon - Durable Nylon fabric. - Mini-Hexagon Ripstop - 300 x 250-denier Duralite/water resistant coating/hexagon ripstop