doesn't really compress

I got these with the intent to compress my clothes to fit in a backpack. I folded different ways and tried rolling and rearranging, but it just doesn't actually compress. The edges pinch down with some struggles with the zipper getting caught, but the middle is still the same thickness. It went down maybe a centimeter. As packing cubes they are good, and I would recommend them. I will be returning them though because I need compression.

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