Well…
With a little help from his mum of course!
This is a different carrier I’m going to try with Goliath. He really loves his backpack, but he can wiggle and shift around too much. My kayak is super heavy and awkward, so I need all the help I can get to make things easier! And it even matches my kayak lol (unintentionally of course!)
Edited to add:
Turns out it works great!