100% Nylon Imported 【Lightweight and Breathable Design】 The hydration backpack is both lightweight and breathable. The pack's shoulder straps, waist straps, and back area are all lined with ventilated mesh cushioning to ensure comfort. This 3 L hydration backpack is suitable for all-day hydration needs. This women's hiking backpack has 2 reflective strips for improved nighttime visibility 【Large Water Bladder】: Insulated hydration backpack's overall capacity is 18L+3L water bladder, the water bladder is made of PEVA material and does not contain BPA. Durable, insulation, kink-free sip tube, and push-lock cushioned bite valve; Large 2-inch (5 cm) opening easy to add ice and clean and dry, just bottom up and it will dry on its own 【Insulated Bladder Compartment】: Hiking backpack with water bladder with the special thermal insulated bladder compartment, hydration packs keep your liquids cool for up to 5 hours to guarantee that you can freely drink ice water 【Multiple Storage Options】: Water backpack for hiking with water bladder compartments of different sizes and functions assure you can bring everything you need for a trip! 3 zipper compartments can store your clothes, iPad, purses, snack, etc. 2 mesh pockets on both sides are perfect for a kettle and an umbrella. And 2 waist pouches on the belt can hold your valuables such as credit cards, phones, keys, etc 【Multiple Usage】: Our hydration backpack 3l bladder is your perfect choice for cycling, camping, running, hiking, music carnival, commuting. This versatile backpack has all the gear you need on the go. This backpack is not suitable for children aged 12 and under 【Thoughtful After-Sales Service】Light, comfortable, practical — N NEVO RHINO Hiking water backpack for women/men is your ideal outdoor companion for hiking or Biking. Any questions? We reply within 24 hours. Lifetime customer support + 1-year quality warranty The hydration pack backpack is lightweight and breathable, ventilated mesh padding is added to the shoulder straps, waist straps, and back area to ensure the comfort of the pack. This water backpack can meet your all-day-long hydration needs. The 3 L hydration bladder backpack has 2 reflective strips. Insulated hydration backpack's overall capacity is 18L & 3L water bladder, the water bladder is made of PEVA material. Durable, insulation, and push-lock cushioned bite valve; hiking backpack with water bladder with the special thermal insulated bladder compartment, hydration packs keep your liquids cool for up to 5 hours to guarantee that you can drink ice water. Water backpack for hiking with water bladder compartments of different sizes and functions assure you can bring everything you need for a trip! hiking hydration backpack 3 L bladder is your perfect choice for cycling, camping, running, hiking, music carnival, commuting. This versatile backpack has all the gear you need on the go. N NEVO RHINO focuses on outdoor sports backpacks, and vitality blooms from here.