Few of us give much thought to what happens to our bags once we drop them off at the airport. We tend to be more concerned about our hand luggage (will they confiscate my shampoo at security?) and duty-free shopping (is this really cheaper than I can find it online?)

But behind the scenes a vast network of conveyors, robots, and people work together to make sure the bag you dropped off at check-in gets on the same plane as you. Few of us actually know what that system involves.

BBC Future was given rare access to this hidden infrastructure at Heathrow airport, so if you have ever wanted to know what happens to your luggage, now you can click here and follow a bag on its journey:

According to the most recent report from Sita (Société Internationale de Télécommunications Aéronautiques), a specialist in air transport communications and information technology, your luggage is becoming less likely to be lost, with the number of “mishandled” bags down by 21.2%. Part of that improvement may be down to the introduction of better technology to transport the cases – and that is continually improving.

A 1,200m conveyor carries the bags below the surface (Credit: Heathrow Airport)

At check-in, bags are tagged with a barcode that enables them to be tracked. British Airways, however, is testing a new ‘digital bag tag’ which has a reusable e-ink screen and enables passengers to load their own barcode using an app. The company hopes it will save frequent fliers valuable minutes by not having to queue for a paper tag to be printed. You can see the digital tag in action in the timelapse (above).

“It’s a process that’s been around for decades and what we’re looking to do is take something that is quite ‘legacy’ into the 21st Century,” says British Airways’ Martin Thomas.

Once the bags leave passengers, they are routed through a maze of layered conveyors, through X-ray machines and other security devices, with regular checks of the barcode along the route to ensure they are going to the right place.

The uniform yellow crates also have ID which keep track of what luggage is on them (Credit: Heathrow Airport)

Heathrow is in the process of developing new baggage handling systems, including one at Terminal 3 known as T3IB. When it’s finished it will be the most modern baggage facility in Europe. The airport claims the system should be capable of handling 110 million bags every year.

T3IB is four storeys high and covers an area roughly equivalent to two football pitches. There are eight miles (13km) of baggage conveyors inside. When fully operational, this part of the airport should be able to deal with 7,200 bags an hour, instead of the current 5,400.

Bamboo is used extensively throughout the system as trays to carry bags

For bags that need to move between terminals, usually for connecting flights, a 0.75mile (1.2km) baggage tunnel connects Terminal 5’s hi-tech facility to the new T3IB in the Central Terminal Area. Automated carts carry bags through the tunnel at up to 26mph (42km/h)

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