The 5-4-3-2-1 packing method is such an ingenious problem solver and so space saving that it’s a little frustrating to think how long it took us to learn about it. We could have been doing just carry-ons or even a weekender bag this whole time!?

Regardless of whether you’re a “throw everything in the suitcase” kind of person or the type to fold everything neatly, you’ve still probably run into a situation where you didn’t have enough space in your luggage. You also probably know what it’s like to return from your trip with those jeans you packed “just in case” never worn but had to make a last-minute pharmacy run because you forgot something else.

So if you want to be a little more efficient at packing before your next vacation, pay close attention: The 5-4-3-2-1 packing method is unbeatable, and you’re guaranteed not to run out of space or outfits. Even better, you’ll avoid any extra costs for checked baggage too.

What is the 5-4-3-2-1 packing method?

It’s difficult to trace who invented the 5-4-3-2-1 packing method, but one of the first to popularize it was blogger Geneva Vanderzeil after she posted about it several years ago. Now, there are thousands of tips and explanations of the method circulating on the internet and social media.

So, what is it? The 5-4-3-2-1 packing method is very simple: The numbers represent the number of certain items of clothing. According to the method, five tops, four bottoms, three shoes, two dresses, and an accessory set—consisting of a jewelry set, sunglasses, and a hat—should go in your suitcase. Depending on the occasion and your destination, the layout can of course be adjusted slightly. For a summer vacation, a swimsuit is obviously essential. If you choose a cooler destination, it’s more likely to be two jackets and not two dresses. However, the basic principle remains the same.