This is the HD soft carry bag I attached to a quick release rear rack.

 

If ya want a pizza box that is Kool but I got a $99 e-bay box and bolt it on/off stock mounts off Craig's list for the 2-3 times a year I take extended trips. It is a little smaller and flimsier than stock HD box but works great for my needs.
Old photo

Did mount a rack on it for big loads...

 

For big trips the TP is awesome. But I like that it's on/off in seconds. The beauty of the RK is how adaptable it is - windshield on/off, etc.


Most of the time my TP is stowed in the garage, but when needed it's wonderful.