Sure thing! Grab a sturdy cardboard box—cut it into a flat sheet, then fold a simple tote shape with a top flap for the strap. Line the inside with old fleece or a denim pocket for cushioning. For the strap, use a strong rubber band or a repurposed elastic belt, then sew a small loop of twine or ribbon at each end so you can tie it across your back. Add a small zipper or button clip to keep the bag closed, and you’ve got a lightweight, upcycled delivery bag ready to roll.