"Backpack Decisions", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License
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"This one is perfect in every way, except that for some reason it's woven from a tungsten mesh, so it weighs 85 pounds and I'll need to carry it around on a hand cart." "That seems like a bad--" "BUT IT HAS THE PERFECT POCKET ARRANGEMENT!"