thanks. Any particular model/item you recommend? Amazon has lots of options with a huge price range
I have the 40oz which was posted on DDMS a while ago. I you're not in a rush to get it, it may be worthwhile waiting around for a good deal. Though not too often, they do drop in price every now and then.
As far as deciding which size you want to get, it's really up to you. It'll depend on what types of hikes etc you want to use it for. It'll also very much depend on how much you're willing to shlep around with you. 40oz is not small, but if you're walking around with barely anything else then that should be good. You may also want to factor in how often you'll have a chance to refill, and/or how many people will be drinking from it.