Pick out a compact bag to put your stuff in. On the right is a small utility bag good for commuters. On the left is a saddle bag handy for sport riding (ie, no grubby hipsters around to steal it).

Get a multi-tool. This is the most important piece as you can use it to tweak or fix most parts of the bike. At minimum, make sure you have 4 & 5mm hex tools and phillips & flat head screwdrivers.

Put it in the bag.

The rest of the kit serves to help you change a flat. Forget patch kits or "mini" tubes. Get a full size spare appropriate for your tires. No need to cut your ride short or change it again at home.

$Add the spare tube to your kit\u2026$

Add the spare tube to your kit…

$Full-size tire levers are essential. You can change a tire with one but they're small so pack two \u2014 you'll be glad you did.$

Full-size tire levers are essential. You can change a tire with one but they're small so pack two — you'll be glad you did.

A hand pump is bulky. Pack a CO2 inflator instead. It's small and good enough to cover you in an emergency. You can always carry a lightweight pump or extra cartridges for long treks.

Pack in the inflator - make sure to leave the nozzle disconnected until you need to use it.

$You never know when you'll need a Hamilton to help you out of a pinch\u2026$

You never know when you'll need a Hamilton to help you out of a pinch…

$\u2026so keep one tucked away in your kit too.$

…so keep one tucked away in your kit too.

If your wheels are bolted on you'll need to carry a 15mm hex wrench. The one shown here, the Jethro Tule by Surly, is beefy yet compact.

$Get all the gear situated in your bag so it cinches up tight\u2026$

Get all the gear situated in your bag so it cinches up tight…

$\u2026and keep it in your backpack so you have it when you need it!$

…and keep it in your backpack so you have it when you need it!

How to assemble an emergency bike repair kit

Assemble an Emergency Bike Repair Kit