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i just bought a bag on ebay for hiking this weekend it was really cheap but not a name brand
my friend just bought a jansport big bear bag for $50 off campmor.com
here is the link http://www.campmor.com/outdoor/gear/Product___10203
okay you probably know this already, but dont buy an oakley pack or any ski company for that matter. Yes I like to support the industry, but not when it comes to thing they don't make haha. Make sure you get an internal frame pack for travel, you could check kelty, jansport, and other cheaper brands. If you don't want to spend a lot stay away from teh top end lines because they run like $300 and up. Check out campmor.com (i used to work there), sierratradingpost.com, and backcountry.com. On backcountry right now there is an ALPS pack for like 110 that would defintiely work for you
So far Dakine has been one of the only brands whose packs haven't broken on me. I love em, but they may not work if you're looking for a big pack. In that case, I have a Jansport that I took backpacking and it held up well. Years of use out of that and it wasn't too expensive either.