Late last year I bought a LowePro Slingshot 102AW for a decent price. I had (and still have) a LowePro backpack for DSLR and laptop and love the quality of their products. The Slingshot seemed ideal for running (biking) around with a DSLR, extra lens and tripod.
But the design never really worked for me. I used it a few times but it never became a love affair, to say the least... I want to be able to quickly have access to my camera: open a velcro flap and that's it. I wound up using an old Sony mini-camcorder bag and the LowePro disappeared in a closet. But the camcorder bag does not hold an extra lens and LCD viewfinder. So I decided to look for a new bag; a shoulderbag that can hold 2 extra lenses and a viewfinder, plus an extra compartment for cards and batteries.
Now I've always liked Crumpler bags. I like their look, the padded, waterproof nylon and thick shoulderpad. And one eBay seller had the right Crumpler bag for the right price: the Messenger Boy 8000 for 45,- incl shipping. That's less than half of what they charge in a store here in Amsterdam. UPS delivered it blazing fast; the very moment a lady stopped by to buy my LowePro Slingshot. The nice thing about the Crumpler is that it is much more versatile than the Slingshot: it holds a DSLR but also my Sony EX1-R videocamera. And take the dividers out and you have a regular messenger bag. I think I love this bag...
