Every inflatable watercraft comes with a manual. In your watercraft's manual, you will find the manufacturer's instructions on the right PSI range for it. Averagely, the recommended PSI is usually between 10 to 15 PSI. Most of the products in this review will meet this requirement and even go higher. The recommended PSI for any watercraft is much lesser than the PSI at which it will burst. However, you shouldn't go ahead to overinflate your kayak for this reason as it won't make your watercraft better in any way.