Reebok Hyperion Backpack w/ Port For Water Bladder - Black w/ Neon Green Trim Breathable PU ripstop / Dimensions: 19.5" x 12.5" x 6.75" Vented pockets for shoes and clothing Water bladder hole that can fit up to 29 Liters (Water Bladder NOT included) Side compression straps and front pocket with bungee system for secure packing Removable waist strap and sternum strap for a great custom fit