Give your reclaimed boxes and bags a sturdy upgrade by adding simple wire...

https://wiki-nest.win/index.php/How_Do_I_Add_a_Soft_Grip_to_3_mm_Wire_Handles%3F

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