I couldn't find a weight limit on this. My fishing kayak is 58 lbs. and works no problem. So I just took the sling and threw it over the top of my kids swing set and hung off the ground . I weigh 187 lbs.
Yes
I used the carrying strap on a 13' two-man sit-in Pelican kayak. I'm 6'3" and strong. It was quite a trip. I had to take in from the marina parking lot to the boat which is about a 300 foot walk. It was a windy day. It will certainly work on a 10' kayak... Hopefully you don't have to carry yours 300 feet.
My kyak is 10 feet long, the strap works great for carrying my Pelican,so I think mayby it would work but might be too short to carry on shoulder.If it doesnt work you could always return it.