Tiancheng_digital via eBay offers this Military Tactical MOLLE Water Bottle Pouch Bag
in four colors (CP Camouflage pictured) for $6.56
plus 99 cents
for shipping. Outside of other eBay sellers, that's the lowest total price we could find by $5. It can be attached to any MOLLE webbing vest, bag, duty belt, or backpack and features a water bottle pouch, zippered pocket, bag clip, D-ring on each side of pouch, and MOLLE attachment loops around the bag, including 6" straps on back.