While I love mine and you'll need to pry it from my cold dead fingers, I wouldn't classify the
Arkel Tailrider as a large trunk bag. Yes, it expands a bit, but when I need to carry pants, for example, I have to strap them under the expansion straps on the top, outside.
I'd classify it as medium-sized, but a lot more stylish than the usual black nylon shoebox ones.
Since I know that you have direct experience with this product, care to comment on how long the velcro used in the mounting straps last? My experience with velcro is it fails over time, and the Tailrider looks like it would last a long time.
Though it is kinda on the pricey side, it would make a nice addition to my ever-growing bag collection. Should I need extra capacity, something like a grocery/market pannier with a shoulder strap could work.