Instruct: Classify a review into positive or negative sentiment.
Query: poor quality

well just took my air mattress camping...spent the night between 3 rocks... i felt them all as the mattress deflated after 20 mins ... the stitching around the air vent was made so poorly you can hear the air escape. Returning policy makes any kind of return useless as you will spend more money shipping it back to the seller. Buy something better...