Fabulous camera backpack! I've had this for about 3 years now. You can fit in this pack:

2-3 pro DSLR's
5-7 extra lenses, 2 flash units
15" laptop
Camelback or other water bladder

It also has a tripod attachment, a built in rain cover, and really nice waist belt for longer treks. Removable top pocket can also be used as a bag on it's own.

I can fit my entire kit listed on KitSplit into this backpack (excluding slider and LED light), plus a bunch of attachments, some water, and snacks, and I'm good to go for a full day shooting on the trail, or out in the elements.

Comes with a host of interior dividers so you can mix & match yourself. Is completely waterproof.