I've known people that have broken Nalgene bottles...you have to fill them to the top, freeze them, and then throw them against rocks 
I've never heard of anyone breaking one of the older flexible white ones though. A hopper with semi-flexible shells and a harder internal frame and feedneck would be ideal.

I've never heard of anyone breaking one of the older flexible white ones though. A hopper with semi-flexible shells and a harder internal frame and feedneck would be ideal.


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