This is a spin-off from another thread:
Travis asks,"Dondo,
Could you describe the conditions surrounding your leaks? (terrain, temperature, placement in pack, location of leak on bladder, what exactly caused the leak, etc…)"
The first time I had trouble with a platy was years ago when I was going on a desert trip near Grand Junction. Early morning in my hotel room, I brushed against a brand new 2L platy filled with water that was sitting on a counter. It fell to the floor and burst along a seam. I couldn't believe it. Luckily, there was a supermarket nearby where I picked up some 2L bottles of water. Back in REI at Denver, the clerk assured my that platys were indeed durable and that I had probably just gotten a bad one. So I got another one.
Another time I used a Nalgene Canteen filled with water as a pillow on a fall trip. I woke up with a soaked sleeping bag. There were no leaks and the cap was on tight, so I'm guessing that the weight of my head just forced some water between the cap and the neck of the bottle.
In 2009, I got pinhole leaks in a 1l play, a 2L platy, and the Nalgene canteen. To be fair, all three were pretty old since I tend to hold on to my gear until it wears out. I'm not really sure how the leaks happened, but I seem to recall that two were along the folds on the bottom and one was on the side. The 1L platy was kept in the side pocket of my Vapor Trail which is pretty abrasion resistant. The 2L platy and the Nalgene were used mostly for camp. So I thinking that the leaks were either punctures that happened in camp or the plastic just wore out along the folds.

