I took a double memory foam mattress, folded it in half and put it in my bag (pretty easy). I sealed it, vacuumed it (5 minutes) and it was nice and compact. Then I rolled it up (not that easy considering it was so tight) and wrapped it with lots of duct tape and clear tape. I did this because I have experience with vacuum bags and know that expecting a cheap plastic bag to stay sealed forever (especially with a mattress inside!) is unreasonable. Anyway, with the tape around it, it lasted about a week and held up well - whether the packaging leaked or not doesn't matter. I think due to the cheap price of this bag I'll use it once to store my mattress for at least a year so I got my money's worth.
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