On the Polaris composite racks the hard boxes do need to be hard mounted--I would suggest to use u bolts and wing nuts--so you can remove easily. The only way to use Polaris' lock and ride system is to attach their anchor kit (purchased thru dealer parts) on the bottom of the box--I'm not totally sure that it fits the Wrap around box--I do know that it fits on the bottom of the CLassic Lounger and that does have storage all the way around. Definately take a look at the Titan Structured Cargo Bag---no zippers, very easy to get into and find things due to the hard plastic inserts in the sidewalls--it has box like features but is a bag. And it can be mounted using straps and buckles--easy on and off--even on a composite rack!! About the only thing you can't do to this, that you could do to a box--is lock it. Happy riding!