Polypropylene plastics are capable of warping especially when they are repeatedly heated and cooled.
The kayaks are basically hollowed out bubbles on the sides and bottom. They were thermoformed, so the plastic was originally heated and then cooled to give it shape. While they are made stiff and durable plastic, putting any sort of long term pressure on the weaker sides, with temperature fluctuations which naturally occur, will eventually cause damage.
Same goes for anything made of polypropylene like Home Depot buckets. While sitting upright - no issue. But fill it with sand, turn it to its side and hang them by straps along the body —overtime the stressed points will begin to warp.
So basically yes you can hang the kayak from it’s side, but in the long term with factors like heating and cooling, it will eventually cause damage. Just my understanding.
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