How to Choose the Right Suitcase Size for Your Trip

The wrong suitcase size costs you either way. Too small and you are sitting on the lid trying to force the zip, or paying for a second bag at the airport. Too big and you carry a half-empty case that still eats your full weight allowance and is harder to move through a crowd. Getting the size right is mostly a matter of matching capacity to trip length honestly, rather than buying the biggest bag and hoping to grow into it. Here is how the sizes break down and which suits which trip.

Suitcase Sizes Explained

Carry-on, roughly 35 to 55 litres. Cabin-sized cases that clear most airline overhead limits at around 56 x 36 x 23cm. They cover a weekend or a short trip without checking anything, and they double as the in-cabin bag on a longer trip. This is the size you reach for most often.

Medium or checked, roughly 70 to 95 litres. The workhorse size for one to two week trips. Big enough for a fortnight of clothes, small enough to stay manageable when full and to sit under the typical 23kg checked allowance without a struggle. If you own one checked bag, this is usually the one.

Large, roughly 100 litres and up. Extended trips, family travel where one case carries several people's clothes, or trips that need bulky gear. A large case is easy to overpack past the weight limit, so it rewards discipline. It earns its place on three-week trips and shared loads rather than as a default.

What Size Suitcase Do You Need? By Trip Length

A weekend or short trip, up to three or four days. A carry-on of 35 to 45 litres covers it, and staying cabin-only skips the baggage carousel entirely. A soft or hybrid carry-on flexes if you buy a little more than you planned.

One to two weeks. A medium checked bag of 70 to 95 litres is the natural fit, ideally paired with a carry-on for the cabin so your valuables and a change of clothes stay with you. This combination covers the majority of holidays Australians take.

Three weeks or more, or family travel. A large case past 100 litres, or a medium checked bag plus a second bag, carries the load. For families, one large shared case is often easier to manage than several small ones, provided it stays under the weight limit. Pack to the allowance rather than the capacity, since a full large bag tips over 23kg easily.

International vs Domestic Travel: Does Size Matter More?

The bag size question changes shape when you cross a border, because the allowance changes.

Domestic Australian flights typically give you a 23kg checked allowance on a standard fare, sometimes less on a basic fare. International economy usually gives you 23kg, occasionally 30kg on some carriers and fare types, with premium cabins higher. A larger case makes sense internationally only if your fare's weight allowance can actually fill it, since a 100-litre bag under a 23kg limit will hit the weight ceiling long before the space runs out.

The practical rule is to size the bag to the weight you are allowed rather than the days you are travelling. A fortnight in a medium checked bag under 23kg is easier to manage than the same clothes rattling around a large case you cannot fill without going overweight.

That covers the hold. The cabin side, what fits as carry-on and the exact limits by airline, belongs to the carry-on size guide for Australian airlines, which pairs with this piece for the complete picture across both bags.

OGIO Suitcases by Size

For a short trip, the Renegade 4-Wheel Carry-On Bag covers a weekend at 33 litres, with front-loading access that suits living out of the bag for a few days, and a soft shell that flexes if you pack a little extra on the way home.

For a longer week, the Alpha Layover Travel Bag handles 40 litres, expanding to 44, and tows onto its larger companion when a trip grows, which gives it the best space-to-weight ratio in the cabin range for travellers watching the allowance.

For a large or extended trip, the Renegade Vault Checked Bag carries a fortnight or more at 95 litres, with a polycarbonate shell and carbon fibre corners that protect the load through a long-haul hold, and for heavier or gear-led loads the Rig range pushes past 120 litres. Across OGIO's suitcases collection the range sorts by size, and the checked bags and hand luggage collections cover the hold and cabin sides separately.