While it isn’t the best practice, many inflatable kayaks can be left inflated for quick use, but there are some considerations. For one, know that air is constantly changing pressure based on the ambient temperature, and if left in the sun, your kayak may overpressurize and spontaneously blow a seam. If leaving your kayak inflated in the sun, let out a good amount of air so there’s room for expansion.
Another consideration is the damage caused by the UV from the sun, which will deteriorate your kayak, given enough exposure. Because of this, we recommend storing your kayak away from the sun if you choose to keep it inflated.