How to pack a carry-on with packing cubes

A carry-on is roughly 40 liters, and once you commit to not checking a bag, every cube has to earn its space. The good news: with a repeatable system, a week fits comfortably in a cabin bag, and you skip the bag-drop line and the carousel entirely. Here's the method, step by step — the same one we'd use for a domestic week or a multi-city Europe trip.

Step 1 — Pick the right cubes for a cabin bag

Use about three cubes sized to your bag: one large for tops, one medium for bottoms, one small for underwear and socks, plus a slim cube or pouch for tech. Slim cubes stack flat and leave gaps for shoes; compression helps if you pack bulky layers. Our carry-on roundup picks sets sized to a cabin bag, and the count guide has the math.

Step 2 — Plan a capsule, not your whole closet

The real carry-on skill is choosing fewer clothes that mix and match. Pick a color palette, plan to re-wear bottoms, and pack for a week even on a longer trip — then do laundry. Under- packing the cubes is the whole game; the cubes just keep the capsule organized.

Step 3 — Roll soft, fold structured, fill each cube firm

Roll t-shirts and casual layers for density and fewer creases; fold shirts and pants to keep them flat. Pack each cube full and flat so clothes can't shift — that's what prevents wrinkles — but don't overstuff past the zipper. See the fold-vs-roll detail in packing cubes vs rolling.

Step 4 — Compress the bulky cube, if you have one

If you're carrying a compression cube for jackets or sweaters, fill it, then work the compression zipper slowly and evenly around the cube. Compress the soft, airy cube; leave the dense one alone, where compression does little.

Step 5 — Load heaviest-first and fill the gaps

Put the heaviest cube (usually bottoms) at the wheel end of a roller or the base of a backpack. Square the cubes so they tessellate with no gaps, then slot shoes, a toiletry bag and soft items into the corners the rectangles leave. Gaps are where things slide and where space is wasted.

Step 6 — Keep liquids and essentials reachable

Keep your quart-size liquids bag near the top for security, per TSA rules, and reserve one cube or pouch for the day-one essentials so you're not unpacking everything on the first night. That's the whole system — repeatable, and it fits.