This is my second set from Nathan, the first has served me very well. I've had these for about two months and today while jogging I felt a small trickle down my back and before I knew it I was soaking wet. The bottom of the bubble burst open and all the water came out. I take care of my gear and only use it for runs (no trails). There is no reason why this should already be open (if at all). I will contact the seller and see if they can make it right. I am extremely disappointed. The only good thing is that it happened during a normal run and not a race.
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