Dang, I misunderstood the title to this post two ways; my brain must really be struggling today. At first I thought this thread would be about how to create a vacuum in a backpack (because isn't that something we all need to carry around with us?), and the second was a vacuum cleaner for a backpack (because of course you'd need a special device to clean out a backpack). Man I need a vacation!
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-Jeff
Rome did not create a great empire by having meetings; they did it by killing all those who opposed them.