Inflatable kayak
Origami kayak, a folding plastic skin with plastic ribs, collapses into a portable box
Skin-on-frame kayak, specially coated canvas/nylon over collapsible aluminum skeleton
Modular kayak, which breaks down into several plastic pieces for storage/transportation
Standard kayak design, the typical modern example of a kayak made of either plastic or composite
Maintaining straight course
On-board storage compartments
Ease of home storage
Maneuverability
Stability
Speed
Ease of transportation