5. Sell your old boxes

Don’t trash those old boxes from your last move. Instead, post them on Box Cycle. Just list your boxes and other moving supplies on the site for free, then sit back and wait for someone to buy your gently used cardboard. The site handles the transaction for you (and takes 50% of the selling price); all you have to do is be available to hand off the boxes to the buyer when they come to pick them up.