Kayaks are generally rather large to be carrying around, but one company created a kayak that can be folded up into a backpack.
The kayak concept was launched on Kickstarter and recently made 128 percent of its goal. They are currently available for pre order on their website for $1,695 per kayak. They are certainly not a bargain, but that seems to be the price you pay for convenience.
Not only are the kayaks foldable to a size that can be checked on an airplane, but they also make storing in the home an easy task as well.