You might want to think about how a wave would prevent you from getting the knife out of your pocket, it's designed as a survival knife. For instance:
What if you get in an auto wreck and need to cut the seatbelt while the car is upside down and leaking gas? You've got it in a pocket and the belt is pressing on it because you're inverted and you can't slide it out because of the wave catching on your pocket.
What if you have an accident while hiking and fall into a ravine where again you need to cut something, say clothes, to help you get out but the pocket with the knife is pinned.