Size:54*30*18CM 
 Volume:30L
 Fabric:Polyester 420D 2 mm ripstop+600D nylon +600D/PU
 Description:
 Intergrated hydration system in main compartment to hold 3L water bladder
 Two side mesh pockets to keep bottles, umbrella,and snacks
 Sliding chest buckle with emergency whistle
 Latest design aluminum frame back panel offer supper light but stable carry system                                                                                                                          Compression straps to adjust the capacity of backpack