NOT strong at all! We received them at the end of April and at the end of July three of them were torn apart with sand scattered everywhere. 3 months is not what I would call a "super heavy regime" at all. We haven't moved them either, they just lie on our patio holding the umbrella stands. Of course, the return period had already expired, so I emailed the seller. At first they responded quickly asking for photos which I sent and after a few weeks I received no further response from the seller. Since then, the fabric has torn on two other bags. Save your money, hypotheses don't hold up.
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