I was just thinking for anyone that wants to use sleeve instead of the cover that comes with the PP, maybe you want to use those cases that are mainly used for portable hard drive cases. I searched around over the web and found some that might work (according to dimension) at case logic. There are not exactly quite 5.9" inches but here are some that might work:
http://www.caselogic.com/portable_ha...modelid=133242
http://www.caselogic.com/neoprene_po...modelid=106096
http://www.caselogic.com/portable_ha...modelid=138035
I don't know if this will add more to the weight or even bulkier than the actual cover or not. I don't have the PP yet so I can't tell ya. I especially like the blue one though. The padding looks like it might not be thick enough to protect the screen though. Maybe some bigger screen GPS cases might work as well. There are a whole bunch of the generic revesible neoprene cases available on ebay also but Im not sure if it's padded enough. Maybe I'll order one and see how that fit.