Radio bug posted in the TOM BIHN Forums:
“I just flew yesterday on a smaller regional jet and my Brain Bag fit under the seat in front of me. It wasn’t completely stuffed, but it was mostly full.”
MagicTiki replied:
“I flew two weeks ago on Southwest and used my Brain Bag as my under seat bag. Mostly full, and no problems getting it under the seat. Just tuck in your straps if you’re on the aisle. 
I have also flown with my ID as the under-seat bag, also without trouble.”
