Will a 28-inch suitcase fit in a Seoul coin locker?

Yes — a large locker (about 50×60×90 cm) fits most 28-inch suitcases. Very wide hard-shell cases can be a tight fit.

How much does a Seoul coin locker cost?

About ₩2,200 (small) to ₩4,400 (large) for the first four hours, then roughly ₩500–₩1,000 per extra hour. No deposit.

Can two suitcases share one locker?

Two carry-ons usually fit a single large locker, which is cheaper than two mediums. Two full checked suitcases will not.

Is it cheaper to store luggage for a whole day?

For a full day or several days, a staffed T-Luggage desk is often cheaper than a locker, since locker hourly fees add up.

Seoul Coin Locker Sizes & Prices: Will My Suitcase Fit?

Seoul lockers come in three sizes, and the only real question most travelers have is whether the big one swallows a full suitcase. It does. Here are the numbers, and what actually fits each one.

The three sizes

Measured width × depth × height, the standard units run roughly:

Small — 50 × 60 × 30 cm. A backpack, a daypack, a couple of shopping bags.
Medium — 50 × 60 × 45 cm. A carry-on, a gym bag, a small duffel.
Large — 50 × 60 × 90 cm. A full checked suitcase, or two carry-ons stacked.

Each station page lists the exact dimensions for that location and how many of each size are free right now.

Will a 28-inch suitcase fit?

Yes, in a large. A 28-inch case is about 50 cm wide and 75–80 cm tall, and the large's 90 cm of height leaves room to spare. The one bag that fights back is a very wide hard-shell — those can be a tight slide-in, so if yours is bulky, glance at the live large-locker count and the listed dimensions before you haul it down.

What it costs

Pricing is flat across the network and tied only to size. For the first four hours on a weekday: about ₩2,200 small, ₩3,300 medium, ₩4,400 large. After that you pay an hourly top-up — roughly ₩500 to ₩1,000 depending on size. No deposit, no minimum beyond the first block.

Paying less

Right-size it. Two carry-ons in one large beats two separate mediums.
Mind the clock. The first four hours are one flat fee; if you'll be out all day, the hourly add-up can pass what a staffed desk charges per day.
Going multi-day? A staffed T-Luggage desk is usually cheaper than feeding a locker for two or three days, and you're not tied to one station.

Backpacks, carry-ons, shopping hauls

You rarely need the large. A day of shopping in Myeongdong fits a small; a single carry-on fits a medium with room for a coat. Save the large for the actual suitcase. For the wider picture — where the lockers are and how to pay as a visitor — start with the full Seoul luggage guide or the foreigner's how-to.