It always freaks me out when I have a fully stuffed backpack. That plus my back exerts a good amount of pressure onto a fully filled water bladder.
I've never had one burst even when skiing but it worries me sometimes. My bladder did leak last year during a day hike but I was fortunate to be able to refill it at a stream; it leaked due to a weak connection but didn't burst.
Obviously filling half way would reduce chances of it bursting and not using an old af bladder would help too.
Question: Would it be retarded to carry the bladder outside your pack for hiking and backpacking? It could be done pretty easily with some shock cord and a hook but wouldn't that potentially cause issues with how balanced your pack is? Not to mention look dumb af