This probably sounds like a really random question, but never mind! I've never been one for buying loads of different drinking cups/bottles at different stages, but the other day it occurred to me that my five year old still uses very baby-ish cups (he just has normal tumblers at the table - I mean when we're out and about etc). I've tried just using normal tumblers around the house, but I find he doesn't drink as much, plus his little brother has a habit of knocking them over. So I want to get some practical non-spill cups, but something a bit more 'grown up'. Any ideas?