The Austrians had a cool camo pattern, and it's a shame that they don't use it anymore. But now you can! The canteen covers are the same shape and design as WW2 US canteen covers but with an Austrian flare. 

Features snap closures, an aluminum hook, one strap on the bottom (some might have a second strap on the back of the cover), and all are insulated.  
They can easily fit a WW2 US canteen, as well as other similar-sized canteens.
 
These are all used so expect some fading and fraying. Most are dated 1973.