[quote=bacpacjac]

There are two important challenges to consider: everything needs to be easy to remove and you need to have somewhere to put things when you want to use the bottle for water.[quote]

There are lots of nylon bags that will encase a 1L bottle and that can be attached easily to a pack or waist strap/belt. While I like to have everything inside my pack, there are occasions where it is nice to place a bottle outside. The bag is an obvious place for all the goodies inside your Nalgene when you need to fill it with water.

So I have, from outside in, the bag, the cup, and the bottle. It makes a fairly handy package.