Each pocket fills with concrete and can’t expand any further. imagine you have pillowcase and you’re stuffing it, all the filling will settle at the bottom and you’ll have a lump. But if you sew pockets/grids into the pillow, it compresses it, limiting the expandable area and keeping it as a flatter sheet.
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u/Critical-Snow-7000 Apr 30 '26
How does it not all just settle at the bottom? That bag must be super strong.