Quick drinking water anytime, anywhere: one-stop supply, 2 water bag compartments on the back, -country sports hydration backpack itself does not contain water bags, if you need a matching water bag, please buy a set (backpack+hydration bag There are 4 storage pockets designed on the front: the large warehouse supports mobile phones under 6.8 inches, and the auxiliary warehouse can store energy gel Comfortable and easy to carry for carrying drinking water while exercising The S-shaped shoulder straps are close to the body, and the force is evenly distributed to relieve shoulder fatigue Expansion net pocket design: can hang trekking poles expansion net pocket design, can put helmets, jackets and other items hidden storage at the bottom of the flexible and convenient use Product Name: Trail Running Bag Product weight: 400g Product size: about 31 x 40cm Size product: Bust 70-128cm Use: running, country, marathon Colour:black+blue Material:nylon Package Contents: 1 x hydration backpack Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.