On a bike with quick release tires, it's easy to fix a flat since the only tools you need are bike levers. When on my mountain or road bike, I'd always have a multitool, flat kit, and a spare tube. On a fixie, however, the wheels are secured with axle nuts and require wrenches to disassemble. When I first started riding a fixie, I was carrying around a 15 mm wrench in my bag to suppress my paranoia of getting a flat and not being able to do anything about it. I eventually stopped lugging the extra weight and just ride, hoping my tires don't get punctured...

How do you deal with getting a flat when you're out and about on a fixie?