Perhaps the problem with the arching of the mattress "house" is due to excessive air pressure inside. It seems the instructions say that you need to pump up somewhere around 60%. I had a small slide when I pumped up hard enough, the next time I pumped up a little less, there was no slide. Haven't used the built in pump yet. Mattress arrived in good condition, no cracks or anything. It is also quite heavy to carry it to picnics - it is better to buy a self-inflating tourist foam.
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