As a backpacker, Nalgenes are vastly overrated for real trekking. They’re rugged for no real reason - you’ll do well swapping your nalgenes for dead simple 1 liter cheap plastic water bottles from the gas station. When they’re empty they weigh nothing and you can crunch them down. And they’re far tougher than one would think - mine are going on years. Weight and volume are the metrics that matter.

Nalgenes are nice for casual around town use though, they’ve got a great aesthetic and the stickers are fun.