Approx. I have had the same spring block housing for 3 years. Between the rough treatment, the cat who thought my feather block was her personal scratching post which I carefully taped shut and just wore out, I got bed bugs. Without a reason. From nowhere. I ordered this suitcase because it had special zippers and was much larger than the reviews. Here are my shortcomings. The "special" Velcro over the zipper is practically useless. If they do fit through the zipper, that extra flap doesn't cover the entire zipper, and the bugs can fit through the loop and hook, i.e. Velcro. It was treated 4 times, everything was pulled out and processed. If you don't, this thing is useless. Be wise, be gentle, and know that this is a long and painful process. I would have given 5 stars if it wasn't for the zipper issue.
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