Hi all, This is probably an odd question - but can anyone offer an idea for a case that would work for carrying my D70 SLR while I'm out rollerblading or biking? Ideally it'd have room for one extra lens, and maybe a filter dense pack. It seems like it'd have to be some sort of small backpack or chest pack that's well padded. The roller-blading part is more critical - for biking I can always pad out a pannier. Thanks!