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Attached Handles - Knotted Reinforced

This has string handles uses soft cord that is passed through four holes cut into the bag. Knots in the cords' ends keep it from pulling through the holes when the bag is filled and lifted.

In this design, knots concentrate forces around the bag's holes when the filled bag is lifted. Some bags use cardboard reinforcing plates (see Movie 1), which are further reinforced when the material in the bag's top gets folded over the card. The plates and added material better distribute the forces coming from the knots. Even with reinforcement, this bag often fails at the handle when the knot pulls through the holes.

MOVIE 1:   50 seconds
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