I can see the need for a yoke to carry the buckets. We had a guy go tripping with us that wanted to use his kayak. Everything was hand carried from a web strap wrapped across his shoulders and behind his neck. Even this got old quick just holding things away from your legs and lifting over rocks beside the trail.

I'd think the buckets would be similar in size to the 30L blue barrels. That's what I use soloing, along with the barrel harness that allows me to carry it and the canoe. Not as cheap as the buckets. But wonder how they compare otherwise.