Free Knight Military Tactical Bottle Holder Main compartment: 10''high x 4''diameter. Frontal: 4''x3.6''x5.9''. Self-repairing YKK zippers with large glove-friendly pull tabs. Attachment webbing: Front and sides. D-rings for optional shoulder strap.(Shoulder strap included). Fits Free Knight 3Day backpack, most tactical vests and packs