I have now used the Canadian Pentax Backpack AKA Kata DR-467 for a shoot, namely the
world-wide photo walk last Saturday. I carried the K20D with FA77, DA12-24, DA50-200, two extra batteries, three filters, remote, cleaners and a mini tripod... all in the lower compartment. The top compartment was perfect for a rain jacket and could have fit a fleece as well, if I was expecting cool weather.
When I first used the backpack I thought it might be uncomfortable, mainly because the side against my back is so straight -- it doesn't really curve to fit your body, mainly because it is built to hold a laptop. But it proved to be quite reasonable hauling this around for 5 hours. It has two straps that can be tied in front of the chest. Though I did not use these they would add stability on a hill climb. The zippers all seem decent though they are not the heavy duty ones you can get on some outdoors gear.
As it happened we were caught in a heavy summer shower so I got to try out the protective shell. I don't know how water repellent the bag is without this extra, but it does increase peace of mind knowing your gear is safe from water with the extra luminous yellow shield in place.
This bag is prefect for the amount of photo gear I'd be likely to carry on a trip. In fact, I could likely fit in a change of clothes, so it might be the only luggage I'd need for a weekend outing. And it is the largest bag I could get that still conforms with the most restrictive airline carry-on allowances.
It has sufficient padding in all areas. The bright yellow interior is perfect for finding little bits that might otherwise hide.
This bag is a winner so far. Plus it's got the Canadian maple leaf -- bonus!
Canadian Pentax Backpack was $130 (plus tax) at Henry's. The Kata DR-467 is 70 pounds sterling in the UK, which amounts to much the same price.