I think it’s a box to pack a bike into to travel with on planes. Wheels are added so you aren’t lugging a bike around in the airport

I couldn't bring myself to spend hundreds on a bike box, at least not without more travel on the horizon. So card board it is. But... Wheels sound nice. So, I got some castors and trimmed some spare 2x6 and now... Wheels!

Derp. Corected typo. Bike box. But, yeah I am considering taking the box for a spin too...