I was a fan of using poland spring bottles until this past weekend. After being on the trail for about a mile i felt my back getting wet. The cap of the water bottle striped out and was leaking a little bit. It had fallen over in my pack and started to leak. It was only a short 4 mile hike and had plenty of water so it was not a problem. only lost a little bit of water so it was just annoying more then anything. With that said I will be moving to a bladder system in my pack and a aluminum bottle.