Bags have a size/weight restriction to protect the ramp crew from injury. If they know that bags (unless marked) will be below a certain weight, they don't run the risk of suddenly trying to heft something 1.5x the normal size and throwing their back out. My question is, if Southwest and some other airlines can have a template at the checkin counter to make sure your bag will fit in the overhead bin, why can't they put in a template for the seats as well? With full dividers under the armrests. Don't fit between them? Buy another seat, fatass. Fuck hurting someone's feefees. Whatabout MY feelings and MY health when I have to sit next so some giant sack of fat that's spilling over into the space that I paid for? While we're at it, if they need a seatbelt extender, they should be REQUIRED to show proof of a second seat being purchased. No second seat = no extender = GTFO the flight, fatty.