I'm on vacation from 20.09.2014 until 05.10.2014. I'll have no access to my mails so please expect a delay of answers during this period.
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I own the Think Tank StreetWalker HardDrive for couple of months now. The Tamrac Expedition 8 is already sold and it is time for a comparison of the two backpacks.
The Expedition 8 offered me enough space to store all the necessary stuff I needed. But it is a very large backpack. Especially because of the heavy padding it needs more space. From my experience with the Think Thank Photo StreetWalker HardDrive I can store nearly the same amount of stuff in it. But the outer dimensions stay handable. This is very comfortable. Since I own the StreetWalker HardDrive I use is very often. The Expedition 8 became a dust trap which was only used to store things at home. The StreetWalker does not. Finally I'm very happy with the decision for the StreetWalker HardDrive and I can highly recommend this backpack (again).