Buy cheap, but twice,
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This review is from: 10 Pack of Vacuum Storage Space Saver Large Bags New ( Bag Size 80cms * 60 cms )
Never more true than with these bags. They seal and suck down nicely, but the next morning have refilled with air, due to the quality of the seals and the valves. I'll keep them, as they suffice for storage, but if I really needed them to shrink down, they would be going back. Not great - you are better off paying more I would think.