Start with a non-corrugated cardboard box like a cracker or cereal box. Keep the bottom of the box unopened or tape shut if necessary. Fold the top flaps inward and crease the sides inward down middle
Punch holes through the front and back layers. Space the holes as wide as possible without punching through the side layers.
Decide how long you want the handles to be, and cut two strings of that length.
Run string through a hole. Tie a knot in the end of string inside the box. Run the other end of string outside to inside through other hole on same side of box. Tie end knot. Repeat for second side.
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