There’s plenty of space in the front of the GLA, so even the very lanky should be able to get comfortable. However, things aren't so impressive in the back, where the GLA offers less knee room than most rivals; anyone over six feet tall will probably find their knees pressed into the seats in front. It’s also worth mentioning that the panoramic glass roof (part of the Plus package) eats into head room significantly.
An electric tailgate is standard with AMG Line trim, and you can drop the GLA’s 60/40 split-folding rear seats to leave an extended boot space with a slightly sloping floor. There’s also a ski hatch that lets you feed long items through the middle rear seat while leaving the outer rear seats free for passengers. That’s about it for flexibility, though; there are no sliding or reclining rear seats, or even clever hidden storage spaces in the boot, leaving the GLA trailing other family SUVs in the versatility stakes.