I use Smart Water bottles because of the flip-top cap. The cap comes only on the 24 oz. bottles but can be used with their 32-oz. bottle. Smart Water bottles are also a bit tougher than your average water bottle. I have some that are 2 years old. They fit narrow pack pockets better than other bottles. And I don't have to worry about losing the cap when taking a drink.

For large containers, I use the 2 liter Evernew containers. Thanks to the lid being attached to the container by a plastic toggle, I can't lose them. With Platypus containers, I was forever losing the lids. Evernew threads are also compatible with Sawyer filters, which the newer Platys are not.

I thought everyone stopped using Nalgenes years ago! They only thing around that's heavier are those metal water bottles that became popular during the BPA scare (most of them, though, are plastic lined).