I waited four months for the Airport Security bag and it's the best bag for me at this time:
1) I don't backpack. So, the wheels are a Godsend. I suggest you look at Kinesis gear for backpacking.
http://www.kgear.com/2) It has strap handles on all sides so removing it from carry-on overhead bins is convenient. Very well engineered.
3) It can hold all my gear: 1Ds Mark II w/ 24-70 f/2.8 attached, 70-200 f/2.8, 400 f/2.8, camera battery charger, portable 40 GB hard drive, and still have room to spare.
4) Excellent construction with plenty of different sized foam inserts.
5) Many zippered pockets for passport, cell phone, filters, etc.
Don't leave home without it...