Wrap your ratchet straps around your hand, with like a 6 inch diameter hole in the donut, put your hand through the "donut" and grab some slack from the end and pull it through but not all the way through. Now pull the donut through the loop you pulled through and pull the end tight. This is also good for taking up slack when used to tie down also.I always wrap my ratchet straps up and tape it with a few wraps of electrical tape.. this way they won't open up and tangle..
No real solution for storage. I too throw them behind the seat