Rothco's Hydration Bladder Pack can be worn on its own as a backpack or easily attach to an existing pack with its MOLLE straps. The versatile pack is available with (item #2964) or without the bladder (item #2965).

Product Details:
MOLLE Compatible Hydration Pack (Bladder Not Included)
Internal Attachment Points For Bladder
Zippered Main Compartment, Interior Mesh Pocket With Zipper Closure
Hydration Pack Measures 16 1/2 Inches  X 6 5/8 Inches X 3 INchesOverall
Hydration Bladder Compatible