This is simple homemade portage yoke that is inexpensive and simple to construct. It works well with no slippage and is quick and easy to attach.
When I carry my kayak from my car top to the lake I can usually just rest the lip of the cockpit on my shoulder with my head inside and carry it the short distance.
Step 1: concept
It slides onto the lip of the cockpit, trapping the lip between the yoke and the lipped spacer. It is then held in place with a bungii cord.