Funny, I used a TA bag in the early '70s for touring. 1976 started racing and never put it on again. I've dissed this current trend.
On a completely different topic - I've been having more issues with high speed wobble on my custom as I age and I ride fast descents with less aggression and confidence. Just read the other day that some find that handlebar bags can minimize wobble. So - I'm going to get a bag just big enough for the items in my seat tool bag and see if that helps. (I think I'll throw on that old TA and give it a try if it isn't too moldy. 46 years of neglect is a long time!)