Flying in economy class can be as torturous as hugging a cactus, especially when the person in the seat in front of you continues to adjust their chair back and forth like they’re competing in the world sit-up championships; and that’s exactly why Knee Defender has been invented.

This genius little device is the ultimate life-hack for the frequent flyer, and prevents any plane seat from reclining beyond a certain point. Need to keep your fold-out tray steady while you chomp down on your mediocre-at-best airline food? Just hook the Knee Defenders on and you’re good to go.

 The pocket-size gadget can also be adjustable according to how much you want to allow the seat in front of you to recline. The closer each clip is placed to the back of the seat, the less the seat will be able to move. The tiny device is about the same size as a house key and is made with “specially shaped grooves” to fit the different seats and tray table found on a variety of planes.

All it needs to be bundled with is a small muzzle for the children in the seat behind you, and then you’re good to go for that 12-hour haul to Australia.

[source: Gadget Duck via The Telegraph]