I carry an 8x10 in mine. I bought it at Walmart and it came in a plastic wrap / packaging. It fits next to my back. I like it and it has served many different purposes so far. My wife has one in her pack worth every bit of the 1 lbs that it takes to lug it around.
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A government big enough to give you everything you want,
is strong enough to take everything you have.
Thomas Jefferson