Already have a Lowepro Slingshot 200 and AW160 for travelling light but having just bought a 70-200 this won't fit.
Found the Calumet BP1500 on ebay UK going for a "buy it now price" of £109.99 (including delivery) but with "a make an offer" button. The transaction went like this:
1. Offered £50 and offer declined immediately
2. Offered £65 and counter offer from Calumet received for £79.99 next morning
3. Waited 10 hours
4. Made my own counter offer to Calumet of £66 and got e-mail confirming bag is mine a few minutes later
There's 6.99 delivery on top so total of £72.99 but still a massive saving of £37 on list price. You can get a bargain using this system if you're persistent and lucky!
Seems to be excellent kit and fulfills my needs perfectly i.e. laptop, tripod, huge camera/lens storage, water holder, carry on for airline.
See good review here: