i usually have a patch kit and levers with me, and if i'm gonna be more than a mile or two from my house i throw a small frame pump and a spare tube in my backpack

the tires i ride (kenda k838) are pretty thick and i've only gotten one flat in the last year so for short trips i don't worry too much about it. most of my riding is within a few mile radius of my house anyways

one time i flatted my rear, then got a slow leak in replacement tube. my buddy used up all his co2 refilling the tube, then had to stop and pump every 15 mins lol.