USMC Hydration Carrier 3L 
 
NSN: 8465-01-531-1753
 
WIll fit any standard mouth 3-liter hydration bladder (not included) and can be attached directly to your pack or  used independently with the backpack straps that are attached.
 
Surplus Item: Good condition may have slight dirt and coyote colors do vary slightly. All buckles and zippers in good working condition.
 
Two options: Single front zipper (first 3 pics) or Dual front zippers (last 3 pics)