If you buy a kayak in Canada it's only US customs you have to deal with, if you decide to declare it, and then you may be liable for duty. When you leave Canada, you have nothing to do with Canadian customs unless you want to stop and fill out a form to be reimbursed for sales (HST) tax you paid when you bought the boat.
A bit off the OP topic, but perhaps helpful to some others.
Have a great trip.
Free Standing Boat Racks
Pull-Up Strap Handle Kit
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