One of my pet peeves is pants (or shorts) with back pockets that have those annoying button down flaps. The very first time you wash them the flaps crinkle up and stick out. And yeah.....I'm NOT going to start ironing my summer shorts. My solution? I sew the flaps down!
Who ever uses back pockets that have to be buttoned anyway? I have a large enough rear end that I sure don't need to start carrying extra junk around back there!