Give your reclaimed boxes and bags a sturdy upgrade with simple wire handles....

https://sethscoolword.publishlane.com/posts/what-is-the-best-way-to-reinforce-a-handle-hole-on-a-paper-bag

Give your reclaimed boxes and bags a sturdy upgrade with simple wire handles. Use 2-3 mm galvanized wire for strength and drill 3-3.5 mm holes to thread the wire through easily