Packing small is essential for any globetrotter committed to embracing the chaos of travel. With a small pack, you can chase down your Japanese train as it unapologetically departs on time. You can squeeze in to (or on top of) the only bus to the next village in India.

Or, as we learned, when your scheduled speed boat leaves while you are busy bailing your guide out of jail, small packs will allow you to cram six large Americans into a tiny fishing boat to splash your way to your deserted island bungalow in time to watch the sunset.

Of course, packing involves deeply personal decisions. Everyone has their own ideas of comfort and style. But by following a few simple field-tested tenets of travelling small, you can shed size and weight. It might not always save your trip, but it will save your spine and your sanity.

Take tough decisions at the start of the packing process to win your freedom on the road © Jordan Siemens / Getty Images

The law of travel physics: the contents of your bag expand to fill the available space

Start with a bag that fits in a plane's overhead compartment with minimal shoving. Fill it with as much as you can with moderate shoving. Leave behind the rest. Tough decisions on your living-room floor will pay big dividends on the road.

Try to be dense

Black holes are so compact that light can not escape their gravity. Your bag should function on a similar principle. Folded is smaller than wadded. Folded and rolled: smaller still. If your clothes take up more than one-third of your bag, you are probably taking too much.

It's not hard to sort out your laundry as you go © Lena Mirisola / Getty Images

The world is not as savage as you think

It turns out, most cultures have figured out how to wash stuff. Whether it be via hotel laundry, a local cleaners, or the old lady around the corner ready to make a few pesos, a clean shirt is usually just a few hours away. At a pinch, most lodgings have a sink and running water.

Everybody loves a trilogy

Three pairs of socks. Three pairs of underwear. Three shirts. Wear one, wash one, dry one. You can get more miles out of leg wear, so two pairs of pants and one culturally appropriate pair of shorts or a skirt should suffice. Choose light, flowing, quick-dry cotton-poly blends in matching colours that handle wrinkles well.

Modern gadgets switch voltage automatically, so no need for bulky chargers © Chad Springer / Getty Images

Your phone is now smarter than you are

Most modern electronics (like phones and cameras) switch voltage automatically when you plug them in. (Double-check the plug where it says ‘Input: 100~240v’.) Leave voltage-specific devices and the heavy converter at home. A three-way splitter plugged into a multi-country adapter should be enough to keep all your devices juiced.

You don't need that. Or that. Or that either

Repeat this to yourself constantly as you pack. The unknown of travelling makes us want to surround ourselves with familiar items but the ‘what if’ game will get you in trouble. On the off-chance you find you do need it, likely you can buy or borrow it. But do bring a quick-drying pack towel, a rare example where synthetic technology outperforms the classics.

The humble sarong: one minute it's a carefree fashion statement, the next it's a portable changing room © Manuel Sulzer / Getty Images

The value of each item increases exponentially with each function

This is best illustrated with some examples.

The frisbee: in addition to its international friend-making potential (walk into any public space and start tossing one around, you'll see), strategically packing it on the outside edge of your pack provides hard-shell protection for breakables. Additional uses: cutting board, plate, bowl, bottle opener, fan, dry place to sit.

A sarong: it's a changing room, it's a blanket, it's a privacy wall, it's a towel, it's a bag, it's a sunshade, it's quite possibly the most versatile piece of cloth in your bag. Oh, it's also a skirt.

A parachute cord: use it to strap things to the outside of your pack, string up a clothes line in your room, tie your bag to the roof of your bus, or tie the roof back on to your bus.

Don't despair – there are lots of ways to sneak extra luggage on to a plane © AlexBrylov / Getty Images

At the airport

Once you've got your pack list dialled down to the essentials, you might find there are one or two items that just won't fit. If necessary, exploit the the airline industry's three biggest luggage loopholes:

1. Wearing is not carrying. Stuff your pockets. Don your jacket. Wear your hiking boots and pack your sandals.

2. ‘Carry on plus one personal item’ should be music to your ears. Consider a small shoulder bag, a camera bag, or smaller backpack for those items you are taking as gifts, and those you will be bringing home as souvenirs.

3. Duty-free doesn't count. If you can't fit it in your bag, many airlines let you carry it on without penalty.

Savvy packer's pack list

This is a list of everything the author takes on a multi-month trip to Southeast Asia. Other destinations may require slight modification.