www.actiongear.comHas several types of canteens. But as others have posted we use wide mouth (NAL)bottles and hydration paks
ECHOŽ GI 1 QUART FLEXIBLE PLASTIC CANTEEN ***READY FOR SOLDIER USE***
At last, a way to get rid of all but one of the old faithful hard shell LC-1 1 Qt. canteens. Made to flex or collapse as water is consumed so you can stash the Echo Flex Canteen when empty, and use the space for other gear, ammo or rations. Soft and pliable, it reduces injuries when landing on your side (a feeling parachute troops know well). Reduces noise of sloshing water of half-full canteens. Same size as the hard shell, and nests inside the canteen cup. Equipped with the M-1 canteen drinking cap for use with drinking tube equipped gas masks. Fits in the standard issue LC-2 One Qt Canteen Cover.