Very hard-wearing plastic! I recently moved and it was just the two of us to carry my queen box spring mattress and mattress topper down two flights of stairs. These sacks were strong enough to push the mattresses down the hall, up the stairs, and finally down the sidewalk into the waiting truck. I understand this is not an ideal scenario, but it gave us the opportunity to thoroughly test the product. Maybe the idea behind the product is to add a strong clasp at the ends. The packing tape didn't hold up very well to all our efforts.
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