camelbacks and other drinking systems

Camelback and similar drinking systems are a really great idea, you can sip on the move and ensure that you stay hydrated. However a dangling hose and dusty conditions can mean that your drinking end gets a dunk in the grit and ends up manky. One good idea I read a while back, not sure of source, was to cut a small hole in the base of a camera film case and then slide this onto the hose, removing the mouthpiece first. You can then use the cap to enclose the end in a protective box. So, remove mouth piece, cut hole in film canister base, slide onto hose, replace mouth piece and then put lid on film case. This works perfectly for most straight mouthpieces, the newer bent camelback ones don't work as well. I use a platypus, so don't have a problem. Makes drinking dust and dirt free, thus more hygenic.