Ir make the wheel attachment rotate 90 degrees when backpacking. Unless that wheel in the picture is plastic it would weagh close to a bike wheel.

I'm just starting to research the single wheel bike trailers, kids don't like riding in the burley trailer anymore so I'm listing it on craigslist. Have my son on a trailerbike behind my bike and my daughter is in a seat on the back of my wife's bike so single wheel bike trailer could be used behind my wife's bike for more gear hauling ability. I could adapt a backpack style like this and unhitch and take like that.