I was wondering has anybody seen any folding baskets that are made to be mounted on top of a rear rack? SO far all that I have found are side mounted racks that wouldn't really work well for me since I just have one bag (backpack) that's pretty heavy about 40-50lbs. I already have the rack that is rated to hold the weight, and I don't feel comfortable just strapping a cargo net over it since I'll be transporting my laptop in the backpack as well. Any help would be greatly appreciated.