This is our 1st Canteen-Strobe Combo pouch with a mesh bottom. It is made with 2 layers of NyTaneon and heavy-duty urethane coated mesh. This is a performance designed pouch that will not absorb moisture or water which can add weight to your gear. The mesh bottom allows for "flow-through" water or sand dranage. The outside utility pouch holds a standard strobe or compass. The lid is adjustable and secured by a silent side release buckle. It attaches to your belt with BTS or A.L.I.C.E. clips. Holds 1 quart.