This little military-looking semi-tactical all-metal mini pump fits into any bag or pocket, and does a remarkably decent job of inflating tires, even fat ones. Being “small,” it takes more strokes, but it’s convenient, indestructible, light, and in two to five minutes, you can fill a 32mm to 55mm tire up to pedaling pressure. 

One size, 4.2 ounces not counting the plastic holder if you carry it on the water bottle bosses instead of tucking it into a bag.