Dear Opal Outdoors. We just returned from a biking trip in the Tirolean Alps. We used the Opal On Your Left Handlebar Bags and the Hold Your Own Bicycle Harness. We peddled up a lot of hills, single and double track trails, using the bags and harness. I really enjoyed having everything on the handlebars and NOT using a backpack...especially for the hot hill climbs. Most of all, I noticed a major improvement in eliminating saddle tenderness when the weight was off my back. I also liked the convenience of having my camera, maps, snacks, and valuables where they were quickly accessible and easy to detach and carry along when we left the bikes. Super nice product!