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The Crumpler does look awkward for a hike. The Amazon suggestion above is pretty economical and may serve you well. If you are interested it something that allows quick access and is comfortable, with extra room for lens, battery, and a small lunch I love my Lowepro Fastpack 200. They have sling versions available, too, but for hiking/walking distances, I much prefer the full backpack support.
The 7D w/ 70-200 2.8 does fit with lens mounted in the Fastpack 200, FYI.