To close a bag without a clip, it's important you pay attention to how you open the bag in the first place.
Turner's method involves folding a triangle 'ear' on each corner and then rolling the bag down. The narrower your folds, the tighter the close will be.
As you near the end of empty space in the bag, push the corners down toward the bottom and pull the triangles out toward the outside edges.
I absolutely love this clever trick. It's easier than it looks, works in a snap, and makes the chip bag pretty much completely airtight.
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