Tried these bags out on my sports bike and they worked out perfectly. Plenty of strong straps and, although there are no instructions, it is simple enough to figure out. Bags didn't move at all after installation. Had them out in the rain and nothing inside got wet (the rain was not too heavy at the time). Pleasantly surprised at how big they were. Enough room for a couple of days worth of clothes, 3 pairs of shoes, rain gear, small wristlet, some bike accessories, and bike cover!! Worth every penny!