Originally Posted by
ATOBTTR
On a recent flight I didn't check my roll-a-board, so my personal item went under the seat in front of me. I was due to arrive in SEA pretty late and thought I'd save 20 min by not checking my suitcase, which meant my backpack went under the seatspace I usually use to stretch me legs. Mere minutes after sitting down, I wished I had checked my roll-a-board.
Protip: once you're in the air, just move the backpack to the space under your legs, right up against the front of your own seat.