Since I wrote my post earlier this year, I made another couple trips across country. On one of those smaller airplanes, even my very small soft-sided carryon wouldn't fit in the overhead bin, so on the next trip, I selected a 14 x 14 "under the seat" soft-sided bag for my medications, electronics, etc.....all those things they say should NOT be checked. Well.....I ended up on a new airplane, and unbelievably to me, this brand new plane had downsized everything, and that tiny case (with no spinning wheels) would NOT fit in the overhead bin, nor would it fit under the seat in front of me. The attendant finally took it up to First Class and stowed it somewhere. I'm usually one of the first to board, so I have my pick of where to put it--but I was certainly surprised that my small bag didn't seem to fit anywhere! Actually, even I didn't seem to fit...not only were the seats narrower, but my seat belt wouldn't fasten! I had never encountered that problem before! The little old lady next to the window offered to change seats with me--which I thought would accomplish nothing, but we did and --lo and behold-- her seatbelt was at least 8 inches longer than mine, so I had no problem fastening it. I guess there must have been a "child's belt" or something in that first seat!
To date, I've only brought aboard a Ginger and a Ewing Dulcimette in their soft cases. The Ginger was my only allowable carry on other than my coat and purse. The Dulcimette I was able to mostly contain within the large tote I was using for a purse and was able to sneak it on that way, without it being counted as a separate carryon item. I've wondered if a bakery bag for long loaves might be helpful in certain cases! I have been on only one flight over the years where nothing was allowed to be under the seat in front of you--except for your feet. Luckily there was enough bin space on that trip (from Indy to Dallas). That was a case where the flight attendant was just making and enforcing her own rules...and I think she'd had a bad day or something. All I had was a very small purse, which I'd taken to a funeral service, but even that had to go in the overhead bin. You just never know what you're going to encounter when you fly......