The chances of tipping over accidentaly are very low. Of course it is possible but we provide good instruction on how to avoid a capsize. On the other hand, there are many days when the water is so inviting, you might like to capsize. Naturally, a larger person will find a kayak less stable (centre of gravity is higher) but again, we give good instruction to help avoid tipping over if you don’t want to. The Ocean Kayaks we use perform well below their capability on our sheltered Myall River tour.