Materials: Quality ABS buckle - Lightweight, Durable Material with Adjustable, Detachable Strap. Demensions: Small, Compact, Goes Anywhere Design is Perfect Where Large Packs are Too Big, Too Bulky, Too Heavy. Strong practicability--There are have two elastic net pockets on both sides of the pack, can be separately placed a 550ml bottles drinks, meet the demand for drinking water for outdoor travel. MOLLE external expansion system designed to be used in combination with other equipment, you can load pockets, water bottle bag, accessory kits and other. Occasion:Perfect for fitness,sports,running,tactical,outdoor,cycling saddle bag.