When choosing the size of a K-pump, you can consider factors such as the pump's intended use and the amount of volume it needs to produce:
K-Mini
This ultra compact pump is good for inflatable crafts like kayaks, pontoons, and kick-boats
K-100
This compact pump is a good choice for inflatable kayakers, float tubers, pontoon boaters, and yacht tenders
K-200
This pump is good for rafts, cata-rafts, and pontoon crafts, and allows the user to stand upright while using it. It has almost double the volume of the K-100
K-40
This compact pump is a popular choice because it's lightweight and easy to pack, but still produces over 70% of the volume of the K-400