Well, I've had them on for a couple hundred miles so far with no issues at all. I like the fact they are narrower than most bags ( about 4" thick), but hold quite a bit. Supposedly waterproof material that remains to be seen. On the left side I have sunglasses, a camera, and a 20 water bottle. On the right (larger bag) I have a small tool kit, first aid kit, extra gloves & hat plus rain gear & another 20 bottle of water and bungee cords with a little room to spare. If you wanted to use that bag as a cooler, you could easily pack lunch, drinks, and ice/ blue ice for two. They secure to an under seat harness similar to the "hooker " rig (bungee points
) with wide HD velcro straps that I can't forsee coming loose if you limit them to a reasonable load wt. Since they are designed with offroad 4 wheeling in mind I suspect they will hold up OK -they seem very well made. You can also switch sides if you like. I actually ordered another set so I'd have two of the larger bags that match, although I may just leave the ones I have now as they are and have a "spare" set. For both sets (including shipping) less than $20