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

https://list-wiki.win/index.php/How_Do_I_Finish_a_Wire_Handle_Wrap_So_It_Does_Not_Unravel%3F

Give your reclaimed boxes and bags a sturdy upgrade with simple wire handles. Use 2-3 mm galvanized wire for strength and durability. Drill 3 to 3.5 mm holes where you want the handles to go