Product details:

The OS-Bottle offers an ultra-durable Hypalon construction to carry your bottles. It hooks on to OS-Panniers, US-Drypacks or Tank system to give you easy access to 2 x one-litre drink or fuel bottles - max bottle size 80mm (3") diameter x 290mm (11") long. A draw-string and compression strap retainer to keep them in place with aircraft-grade alloy buckles and heavy-duty Acetal cam buckles. This also comes with a ten-year manufacturer's guarantee!