Description 【PERFECT SET】Small size hydration backpack water backpack: 16.5 x 9.5 x 2.8 inch with adjustable shoulder/ chest/waist straps. Comes with a 70 oz / 2 Liter BPA FREE food grade hydration bladder made of PEVA material【THERMAL INSULATION 4 HOURS】The main compartment contains an insulated pocket, keep your bladder drink cool for up to 4 hours, that’s cool!【REPLACEABLE 2L BLADDER】The opening is a large design, with an extra-wide diameter of 3.1 inches screw cap, which makes for easy pouring of water and putting ice inside, removable drinking tube【LIGHTWEIGHT & SPLASH RESISTANCE & DURABLE】Perfect outdoor sports gear, made of lightweight and water-resistant nylon material, padded shoulder straps, comfortable for long-distance running, hiking, cycling【MULTIPLE STORAGE COMPARTMENT】This hydration pack has multiple pockets, a lot of pockets can store various necessities outdoor. The front mesh pocket allows you to pack even more hiking equipmentGood for hiking, Camping, Cycling and multisport Comes with water bladderWhen you are thirsty and when you need water, this hydration backpack has you covered enough water for a 2-hour for running, riding or cycling. Multi-function and lots of pockets perfect for your sports needs.Designed for your comfort in mind, the water backpack can be fully adjusted in the shoulder, chest, and waist, through 2 adjustable belts. Multi-function Backpack Main PartLots of pockets for small items or medical first-aid suppliesTop side hole for earphoneFixtures for water pipeHose clip in the strap, avoid water pipes jumping during exercise2 additional rings for hooking your needs