I went to the Apple Store two weeks ago to pick up a Brenthaven backpack, and was rather annoyed when they were out of stock. I mentioned that I loved my Kensington backpack for my Titanium and wished I didn't have to replace it. Apple Store employee helpfully pointed out that the 17" fits in the 15" Kensington bag, provided you put it in the OUTER pocket. This after I had walked around with the bag flapping open for a week. So now all of my cables, etc., are in the inner pocket, the 17" is in the outer, and I spent the backpack money on a new battery. Maybe this can help someone else. Caveats: The outer pocket doesn't have any padding, and the computer does jut slightly out of the bag with the flap over it. The flap keeps it secure, but I'd be more careful about using this on rainy days than I had to be before. Or revert to the old "get some plastic shopping bags and shrinkwrap the baby" trick. Since the nice flat computer is now on the inside, all of the bulky stuff is now on the outside, where it makes contact with your back. This is noticeably more uncomfortable. I'm planning on solving both problems with a stiff cardboard backer and some padded inserts. Best, Jeff