Even X-Wing pilots need to carry some stuff with them when they go out on a mission. They use the Star Wars Rebel Alliance Icon Backpack and so should you.
Use it to carry all of your important rebel things, like flight manuals, spare parts, whatever. The important thing is that this will match your flight suit.
It makes a great gift for anyone who wants to be a rebel pilot. And it is fashionable. $56.21 from Amazon.com. Carry your stuff like a true rebel.