Generally, hitting a rock should not harm your packraft. This is because the inflatable design allows the boat to yield and absorb the energy of impact. Additionally, the scratch-resistant polyurethane coating on the exterior of the boat is able to resist mechanical stress such as contact with rough stones. The underlying fabric also has appropriate tear strength, unlike film materials that can be easily punctured. All packrafts on the market meet basic requirements for durability and safety. However, it is important to note that there are still limits and differences between models based on factors like the size of the payload and the type of rocks you may encounter. It is also important to avoid placing hard objects in the boat, as this can increase mechanical stress and potentially cause damage.