I have long searched for a photo backpack, like a hiking backpack has a clever back ventilation and a laptop compartment. This is the only one I've found that meets these requirements. It can be worn very comfortable, the seat stays dry. In addition to the laptop (MacBook Pro 15 inch fits perfectly pure) can be even more comfortable with the camera 3-4 lenses, a tripod (to fix the outside) a raincoat, water (both still quite large daypack above) accommodate and various odds and ends. For small parts, there are 3 thoughtful subjects that have eg extra pockets for memory cards, pens or mobile phones. The camera compartment opens to the right side, so you can take out the camera comfortably, if you hang the backpack over his right shoulder, without removing the backpack. This is even if you have a tripod on the backpack. But you should then sort the zips neatly, so you no longer need these by fumble under the tripod. The only drawback is that you only rankommt the lenses, when a tripod is entrained (or this is taken off), since the stand is located directly in front of the camera bag.
Apart from this shortcoming of the perfect photo backpack with plenty of room and a very pleasant carrying system!
