I'm using the US30 and I think it's pretty great. What I'd really love to have is a simple, top loading semi-rigid case that could be packed with clothing and stuff, then slid inside the US30. This would keep my clothes in decent shape, be much easier to pack, and provide some rigidity to the US30 when cinching the straps. I'm about to start looking for a suitcase with the right outer dimensions (or close to it), or maybe even a Tupperware would work. Has anyone gone this route yet?