I'VE USED THIS NOW FOR ABOUT 6 MONTHS (DURING THE HOTTEST DAYS OF THIS VIRGINIA SUMMER) AND I AM AMAZED AT HOW COLD THE WATER STAYS FOR THE ENTIRE DAY. It fits easily on my k1600 with no interference with the handlebars and fuel cap. I can drink while riding, although it is a bit challenging with my full helmet. The bladder is easy to fill, so even if I'm just taking a short 2 hour ride, I'll fill it with ice and water. And yes, some might say I installed it "upside down", but the straps worked out better this way.