Five tops. Four bottoms. Three pairs of shoes. Two extra layers. One wildcard item. That’s the specific version of the 5-4-3-2-1 rule tested here, against two real weeks of carry-on-only travel through the Balkans — and, in the interest of stating the result before the reasoning, right around half of it held up.
Where the rule actually comes from. It’s tempting to treat “5-4-3-2-1” as one of those packing rules that floats around with no clear source, the packing-world equivalent of a folk remedy. This one has an actual origin, though. Blogger Geneva Vanderzeil, who writes at A Pair and a Spare, has said she put together a version of the formula close to a decade ago — a resort-focused breakdown of five tops, four bottoms, three dresses, two bags or jackets, and one pair of overalls, aimed at carry-on-only travel for warm-weather trips. It picked up wider syndication later on, including a Reader’s Digest write-up that paraphrases it as five tops, four bottoms, three pairs of shoes, two dresses, and one set of accessories, and a fresh round of popularity on TikTok pushed the phrase further still, the way a clean, memorable number sequence tends to travel further than the reasoning behind it. Vanderzeil herself later published an updated, cooler-weather version, by her own account because readers kept asking for one, which is itself a useful signal: even the person who devised the formula didn’t treat it as fixed.
None of those published versions match exactly, which is worth noting before going further: even the people who use and popularize this formula don’t agree on what the last three numbers stand for. The version tested for this post — three pairs of shoes, two extra layers, one wildcard, rather than dresses, jackets, or a fixed accessories set — is a further adaptation, suited to overland travel with genuinely variable weather rather than a single warm-weather stay. It’s presented here as exactly that: a real, documented formula with a traceable origin, adapted for a different kind of trip, not a fixed universal standard that happens to have been discovered rather than built. Anyone borrowing the number sequence for their own trip should feel just as free to swap the categories again — the number is the useful part, not the specific five things it was originally attached to.
The constraint the formula is actually answering to. Before the category-by-category verdict, it’s worth naming what all five numbers are really negotiating with: weight and space limits that are stricter than most people assume until they’ve weighed a packed bag against one. The cabin bag allowances covered in more detail on this blog’s carry-on pillar post cap out at 15kg on easyJet’s included bag and 10kg on the paid, larger cabin bags offered by both Ryanair and Wizz Air. Ten kilograms sounds generous until shoes, a wash bag, and a laptop are already most of the way there before a single top gets counted. A formula like 5-4-3-2-1 is, underneath the memorable phrasing, a way of pre-negotiating that weight budget across categories before the scale forces the issue at a check-in counter.
Five tops: about right. Five held up well against a realistic laundry rhythm — wear, wear, wear, wash, repeat — without ever forcing the same top twice in a row. The adjustment that mattered more than the count was fabric. A rotation heavy on plain cotton tees ran into the ordinary problem cotton has always had: it holds onto moisture and odor after a warm day of walking, which matters more on a trip where laundry happens roughly once a week rather than daily. Merino wool tops fared visibly better in the same rotation, for reasons that have real fabric science behind them rather than just marketing copy — merino fiber is naturally hydrophobic, so water tends to bead on the surface rather than soak in, and the fiber structure absorbs and traps odor-causing molecules until an actual wash rather than releasing them back out over a day of wear, according to REI’s own materials guidance on the fabric. In practice, that meant two of the five tops could stretch to a second wear between washes without becoming a problem, which a cotton-only rotation never allowed. The trade-off is real too — merino tops generally cost more than a plain cotton tee and can feel warmer than expected on the hottest coastal afternoons — but for a five-slot category doing this much work over two weeks, the odor-resistance alone justifies at least two of the five slots going to it rather than all five to cotton.
Four bottoms: one too many, but not the obvious one. Two pairs of trousers and two pairs of shorts looked balanced on a packing list. In practice, one pair of trousers handled every travel day and one pair of shorts handled almost everything else, and the second pair of each barely left the bag. The fix isn’t dropping to three of the same categories — it’s dropping to three genuinely different items: one trousers, one shorts, one packable skirt or similar layer-friendly alternative, so each piece does a distinct job instead of sitting in the bag as a spare of something already there. The pattern underneath this one is worth naming on its own: doubling up on a category is a worse use of a limited slot count than diversifying it, even when the doubled-up version feels safer while packing.
Three pairs of shoes: this is the number that broke. A walking shoe, a sandal, and one “nicer” pair for evenings is the classic packing-list trio, and it’s the one that doesn’t survive contact with a real two-week overland trip. The nicer pair got worn on exactly two evenings out of fourteen. Shoes are the heaviest, least space-efficient category in a carry-on for how rarely a third option actually gets used, and the cost isn’t abstract: the paid, larger cabin bag allowances on both Ryanair and Wizz Air cap out at 10kg, and shoes eat into that ceiling faster than almost anything else packed by volume, since a single pair can weigh close to what an entire top-and-bottom outfit weighs combined. Two pairs — one genuinely capable walking shoe, one sandal that can pass for evenings with a slightly nicer outfit on top — covered the entire trip without a gap that was ever actually felt.
Two extra layers: about right, arguably one short. A packable rain shell and a thin fleece earned their space on cold mornings and a handful of unexpectedly chilly evenings, particularly inland and at elevation, where the temperature swing between a coastal afternoon and a mountain-town evening was consistently underestimated in advance. If anything in the formula deserved an extra slot, it was here rather than in shoes or bottoms — a third light layer, not a full jacket, just another thin option, would have meant relying on the same fleece slightly less often on the coldest evenings, and would have cost far less in weight and space than the third pair of shoes it would effectively be traded against.
One wildcard: correct, and the number that overperformed. A single flexible extra — a swimsuit, in this case, doubling as the answer to a beach day or an unplanned hot spring — earned its place precisely because it was chosen for the actual trip rather than defaulted to out of habit. The lesson isn’t “always pack a swimsuit.” It’s that the wildcard slot works when it’s picked deliberately for where the trip is actually going, and fails when it’s filled with a generic “nice outfit” packed for an occasion that was never really on the itinerary. Of all five numbers, this is the one that most depends on the traveler doing a small amount of thinking about their own specific route before packing, rather than following the formula on autopilot.
The revised version. Five tops, weighted toward merino or a similar quick-dry fabric rather than plain cotton. Three bottoms, each doing a different job rather than four with real overlap. Two shoes instead of three, keeping the evening pair only if it can double as the walking pair. Three light layers instead of two. One wildcard, chosen for the specific destination rather than packed on autopilot. The total item count barely moves — fourteen items instead of fifteen, one fewer overall despite the added layer — because it’s mostly a redistribution away from the category that quietly goes unused (a third pair of shoes) and toward the one that quietly saves an evening (a third light layer), which is a more useful outcome than either adding wholesale to the formula or defending the original unchanged out of loyalty to a clean-looking number sequence.
What the exercise is actually for. The specific numbers matter less than what testing them against a real two weeks forces into view. Shoes are the classic overpack, in this trial and by reputation generally — heavy, bulky, and rarely worth a third pair once weight limits like the 10kg cap common on budget-carrier cabin bags are taken seriously. Layers are the classic underpack, particularly on a trip that crosses coastal warmth and inland cold within the same two weeks, a pattern this blog’s winter packing post covers in more depth for the extreme version of the same problem. A formula this clean is genuinely useful as a starting draft, not because five-four-three-two-one is some discovered constant of good packing, but because a named, popular version of it already exists, has a real author with a real change-of-mind on record, and gives something concrete enough to test rather than a vague instruction to “pack light.” The value was never the exact numbers. It was having numbers specific enough to be provably wrong in one direction and provably right in another, which a looser rule of thumb never allows anyone to discover about their own packing habits.
For the itemized version of what filled the bag once these numbers were finalized, rather than the formula behind it, Two Weeks in Europe, Carry-On Only: What Actually Went In covers the literal inventory, item by item. For the broader case behind traveling this way at all — why the weight and size limits above matter enough to build a whole packing philosophy around in the first place — Rework the carry-on pillar is where that argument gets made in full.
Sources
- The 5-4-3-2-1 Packing Method: Carry-On Only, Every Trip (Geneva Vanderzeil)
- What Is the 5-4-3-2-1 Packing Method, and Why Do Travel Pros Swear by It? – Reader’s Digest
- All about Merino Wool Performance Fabric | REI Expert Advice
- Ryanair 2026 Baggage Allowance – My Baggage
- Wizz Air 2026 Baggage Allowance | My Baggage