Hey all, just in case you are curious, I ordered a ThinkTank Digital 40. I will be testing it in the next week or two. I will post a follow up after I have taken it for a test run to let you guys know if it is all I am hoping it will be, or if I just wasted $80! Thanks again for all your input. I am still interested in the keyhole, I just need to figure out if it is compatible with my bag, and how I would carry an extra lens within reach.