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What Actually Happens to Your Suitcase in the Hold

Published 11 August 2026

The short answer

Your suitcase is not carried. It is dropped, slid, tipped, stacked and driven across tarmac, usually more than once, and always by people who have never seen it before and are working to a clock. Pack for that and almost nothing goes wrong. Pack as though someone will carry it upright the whole way, and you get the broken wheel, the burst zip and the shampoo through the shirts.

Three rules cover most of it: nothing you cannot replace goes in the hold, weight sits low and against the wheels, and every void gets filled so nothing can move.

What your bag actually goes through

From the moment it leaves the check-in desk, a checked bag has a fairly rough day.

It goes onto a conveyor and into a sortation system, where it is scanned, diverted, and sent down chutes with drops in them. It lands in a container or on a cart. The cart is towed across open tarmac — in Singapore, that often means sun, and it can equally mean a downpour. It is then lifted or thrown into the hold and stacked with other bags on top of it. On arrival the process runs in reverse. If you have a connection, the whole sequence happens again, usually faster.

Nothing about that is unusual or careless. It is simply what moving several thousand bags an hour looks like. But it explains every common failure.

What actually breaks, and why

Wheels and handle housings. They stick out, so they take the first impact on every drop and the load when the bag is dragged sideways. Most "damaged luggage" claims are wheels.
Zips. Not the zip itself usually — the pull, or the teeth at the corner where an overpacked bag forces the line apart. Overpacking is the cause; the zip is the symptom.
External pockets. Anything protruding catches on conveyor edges and neighbouring bags.
Straps and loose tags. Long straps get caught in machinery. Old bag tags confuse scanners and, occasionally, humans.
Whatever was rigid inside. A hard object pressed against the shell from the inside turns an ordinary impact into a split.

Notice that four of the five are about the outside of the bag, not the inside. Reducing what protrudes is the single cheapest improvement you can make.

Pack from the wheels up

The principle is that of any load: heavy low, light high, nothing loose.

Heaviest items go against the wheel end, so that when the case stands upright the weight sits at the bottom. A case with its weight at the top tips constantly, drags badly, and lands harder.
Build in layers rather than dropping things in. A flat base of the heaviest things, then the bulk of your clothing, then flat and light items on the top face.
Fill every void. Empty space is what allows the contents to shift, and a bag whose contents shift arrives dented in odd places. Socks and underwear go inside shoes; soft items pad the corners.
Roll what creases badly, fold what does not. Rolling is not magic, but it removes air, and removing air removes movement.
Use cubes or bags to group things. Their real benefit is not tidiness — it is that a packed cube is a solid block that cannot redistribute itself in transit.
Close it and press. If you have to kneel on the case to close it, take something out. That pressure is exactly what breaks zips.

Liquids, and the reason they leak

The hold is not the same environment as the cabin, and containers that were closed on the ground can weep in the air. Anything liquid should be decanted into a bottle you trust, closed firmly, and then sealed inside a bag of its own — ideally two, one inside the other.

Put the whole lot in the centre of the case, surrounded by clothing, rather than in an outer pocket. If something does leak, you want the clothing to be the barrier between it and the rest of your packing, not the first casualty.

What should never be in the hold

Medication, in its original packaging, plus a day or two more than the trip needs.
Passport, documents, cards, cash, jewellery, keys.
Laptops, cameras, phones and their chargers. Note also that airlines require spare lithium batteries and power banks to travel in the cabin rather than the hold — check your airline's dangerous goods page before you fly, because the details differ by carrier.
Anything with sentimental value. Compensation is calculated in money, and money is not what makes those things valuable.
One change of clothes. Not a rule so much as a kindness to yourself. If the bag is delayed, that is the difference between an inconvenience and a bad evening.

Fragile things, if you truly must

The honest advice is not to check anything fragile. If it cannot be avoided, treat it as engineering rather than packing: the item goes in the geometric centre of the case, wrapped, with soft padding on all six sides, and nothing hard next to it. It should be impossible for the item to touch the shell no matter which way the bag is turned.

A "fragile" sticker is worth asking for and worth having, but it is a request, not a guarantee. Design your packing as though nobody sees it.

The five minutes before you leave the house

Strip the old tags off. Every previous flight's sticker and barcode. They are a genuine cause of misrouting.
Tuck away or remove straps. Anything that dangles is something to catch.
Label inside and out. An external tag with a phone number and email, and a card inside the case with the same details plus your itinerary. External tags come off; the internal one is what reunites you with a bag whose tag is gone.
Lock it properly. If you are travelling through the United States, use a TSA-recognised lock — otherwise inspectors are entitled to cut a non-compliant one. Position the zip pulls where the lock holds them together, not loose at the top of the arc.
Photograph the packed contents and then the closed bag. This takes twenty seconds and it is the single most useful thing in this article if something goes wrong. A dated photograph of what was inside and what the case looked like before check-in is worth more than any amount of recollection at a claims desk.

At the belt on arrival

Do not walk out of the hall without looking at your bag properly. Stand it up, roll it a few metres, check the wheels turn, check the handle extends and retracts, and look at the shell and the zip line.

Damage has to be reported before you leave the airport in almost every airline's process. Once you are outside, you are arguing about where the damage happened, and that is an argument you generally lose. The same applies if the bag has been opened for inspection and not closed properly — note it there and then.

The habit that makes all of this easier

Keep a short written list of what is in the case, made as you pack. It takes a couple of minutes and it does three jobs: it stops you forgetting the charger, it tells you instantly whether anything is missing after an inspection, and if a bag is genuinely lost it becomes the itemised claim you would otherwise have to reconstruct from memory weeks later.

Nobody enjoys making lists before a holiday. Everybody who has had to make one afterwards wishes they had.