Camelbakhydration Pack

Two full-length compartments, plus a dedicated reservoir compartment for organizing your gear
Padded harness and removeable waistbelt for added comfort and stability.
Adjustable compression straps for minimum or maximum compression.
Dual antenna ports on either side of top drag handle.
Upper and lower drink tube exit ports for routing the tube over shoulder or under the arm to wearer's front.

 
 This pack is a favorite of the Navy SEALS. If it's tough enough for them, it's tough enough for damn near anybody.