ROPTAT hydration backpack features a sleek & slim design, durable and ultralight backpack that allows you to take your water and essentials for all outdoor activities from cycling, marathons, hiking or jogging in the park. With adjustable chest & waist straps, it\'s comfortable for kids men and women. Storage pocket is deep enough for snacks and wallet, constructed of premium water-resistant material to ensure that it can handle outdoor activitieMaterial Nylon*Super lightweight hydration backpack pack is compact and low-profile and perfectly built for lightweight pursuits like running, road biking and ultralight hiking .This hydration pack backpack feel light and stable on your back and wont create any wind resistance.*This water resistant backpack has adjustable hip belt and shoulder straps that can be modified to fit your torso, which can be used as women , men and kids hydration backpack.* With breathable backpack panel for dry , this water backpack will keep you away from the wear and tear during sports .Hydration Bladder* 2 liters (70 oz)Water Bladder for Hydration Pack:This popular bladder sizes offer a nice balance of reasonable weight and bulk while providing a sufficient quantity of water.*Quick-disconnect tubing:This backpack water bladder include a drink tube that easily disconnects from the body of the bladder, which is nice when its time to refill the bladder mid-hike.You simply disconnect the tube with the press of a button and pull the bladder from your pack.This allows you to leave the tube in place, which is especially handy if you have it routed through a tube portal.*Wide-mouth opening:This bladder is with Wide-mouth opening ,which allow you to fit a hand inside the bladder, which makes cleaning and drying easy.And You can easily add ice from a scoop or an ice dispenser. It will keep the water cool up to 4 hours .

• 【Adjustable Size & FUNCTIONAL】 Hydration Backpack have fully adjustable shoulder,chest straps and waist adjuster,which helps you easily adjust water backpack size to fit your torso,Teenagers/kids with 27\" up to adults (men and women) with 40\" chest size,the waist 21\"to 33\".
• 【Lightweight&Compact Water Backpack】Hydration Backpack is made of comfortable and waterproof nylon fabric,compact design your feeling is lightwight and stable without any wind resistance when you use it,The hydration pack\'s bottom also equipped invisible helmet holder pocket ,the shoulder strap is with clip fix bladder.
• 【Insulated Hydration 】This hiking daypack has an insulation compartment which can hold a 2L Hydration bladder and your drink can be kept cool up to 4 hours in running,cycling biking,hiking,the cycling backpack is equipped with inner bladder fastener will reduce the bladder\'s bouncing during movement.
• 【BPA FREE hydration bladder 70 Ounce-2 Liter】Included 2L leakproof and stability hydration bladder,complete with soft high flow bite mouthpiece with easily accessible on/off,valve BPA FREE food grade,test report will be sent to your e-mail.the size of water bladder is perfect offer a nice balance of reasonable weight and bulk while providing a sufficient quantity of water.
• 【Perfect gear for outdoor Activities】The hydration pack is perfect gear for cycling, camping, running,music festival, rave , kayaking，short trip, walking, mountaineering and ultralight hiking,Best holiday Gift for families and friends who love outdoor sports.