I was actually comtemplating casting one this morning...an awful lot of work for a one-off product. Useful if you really really want something custom, but I don't really care--I'm a USGI canteen & cup combo guy.
Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein