Long shot here - has anyone flown in this backpack on the ERJ-145 Regional Jet? The overheads are small. There isn't much room under seat "A" but "B" has a tons of space and "C" has descent space as well. I think it might fit if I can get seat B or C (or better yet no one next to me). I have a flight tomorrow and I'm trying to figure out the best way to pack the P3P.