Lowepro Vertex 100 AW - £100/$200
Well suited to wet climates, the Lowepro Vertex 100 AW has weatherproof zips on its camera and laptop compartments, plus a slip-over rain cover that stows away in the bottom of the bag.
The camera compartment runs the full height of the bag and is big enough to take two DSLRs with fairly small lenses attached, plus up to four other lenses and flashguns. As usual, the laptop compartment annoyingly isn't quite tall enough for a 15-inch widescreen device.
Unlike the Lowepro DSLR Video Pack 250 AW, there isn't a side-opening system for quick camera access - but a plus point is that there's a sliplock system loop on either side. These make it easy to add Lowepro's lens pouches externally, for carrying extra lenses or other accessories as and when you need to. A simple Velcro locking system is easy to use and very secure.
The tripod attachment system is similarly robust, using a pull-out fastener at the top and an additional loop you can slide up and down the front of the bag. For even greater security, there's an extra tripod foot holder, which you can loop onto the bottom of the bag. Two external pockets on the front make it easy to organise the loose ends or your kit, one of which has a memory card organiser.