Day 3 of my first tour with this bag, the sun is finally shining. Unfortunately the heat is literally dissolving the "sonically welded seams" and the bag is completely falling apart. It's now completely useless and I threw it away -- not going to carry a broken bag around for another 5 days of riding.On a positive note though, the US distributor responds very quickly and is willing to ship a new bag for free.Edit: The second bag lasted for about 3 days in the sun, then the seams tore as well. Super-glue fixed it temporarily but it's long since in the trash as well. Stay clear of this product!