Mil-spec is generally called USAF Pilot's Flask. see: http://www.equipped.org/pp/pic729.htm<br><br>Yes, the Coghlan flask is the same, one size only. You can find smaller and larger sizes at many liqour outlets, at least around here. There is also a Lexan version of this sort of flask, but it's quite a bit bulkier.<br><br>Doug Ritter<br>Editor<br>Equipped To Survive