I'm looking for a sleeve for my 15" powerbook, usually to be carried in a timbuk messenger bag. I want something that keeps a low profile and takes up as little space as possible while still protecting the computer. I had a tucano for my 12" PB and it was quite nice, although not particularly padded. I figured if I drop the computer the tucano will protect from scratches, etc, but if its a hard enough fall to damage the computer I'm screwed either way. The InCase sleeve has a bit more padding, but is it really enough to make a difference in the event of a fall or knock compared to the extra bulk?