I'm an Osprey guy and they have a lifetime no questions ask warranty on the PACK not so much the bladder. Mine sprung a leak last year and I keep trying to fix it but is also in not really patchable spot where the hose enters the pack on a seam. I'm cheap and don't want to spend the $50 for a new bladder so I've tried tire patches and finally just globbed E6000 glue all over the place and that slowed it down enough that it doesn't bother me. Downside it made the water taste awful and I had to keep filling it, letting it sit, and drain it over and over to get ride of the taste. Pack is about 10 years old so I can't complain too much about the bladder springing a leak and I use it a lot.