This stuff makes me laugh sometimes, but here you go anyway.
The DR gap reel has a double ended snap for attachment point.
The same double ender used on a spool. Go figure...........
It is minimally larger than a spool, but it will easily go in a thigh pocket, which is where I carry mine. If you can't use a simple gap reel without birdnesting it, then you can't use a larger reel without the same risk of entanglement either, so if your "reel challenged" then you should be using huge spools as well as the small one for line work. Is anyone using spools of various sizes in their arsenal ?
I have used various designs of gap and standard reels in the last 17 years in the worst conditions you can imagine. The spool is no different, it simply lacks a frame, but the function is the same. It pays out line, and it can be used to bring it back in. It has an inherent drawback as well, and that is severe twisting of the line, which can cause a CF as well as any conventional design.
I can use a spool just as easy for very short distances, which was the original intent, without twisting, by using the side holes much like a handle and winding the line straight on instead of around the perimeter.
It all comes down to the intended use and using the right tool for the job.