AONIJIE C933S 5L Running Hydration Backpack Blue Purple Color Vest Bags Soft Water Bladder Flask for Hiking Trail Running Marathon Race
Lightweight cross-country backpack
Double water replenishment scheme 
Comfortable fit 
Goes hand in hand
Human body mapping design 
Fit the torso of the human body
Four-sided elastic fabric
High elastic breathable
Design of nylon four-sided elastic fabric 
High elastic skin-friendly and not tight
1.5 L water bag bin, hanging buckle to prevent shaking
Waist clothing storage bin
Can hold light clothes, skin clothes, etc.
Built-in first aid blanket bin
Provide warm measures at night
Built-in key hook
Prevent key loss
Attached survival whistle
Ensure the survival safety of cross-country running