My perfect SAK is one of the one or two layer SAK's. Slim enough to fit n a pocket unnoticed, even in dockers or dress pants. Yet has enough capability to handle those everyday little problems that pop up. A loose screw, opening a cold brewski, cutting something. Bantam, classic, recruit, tinkers, are some of the best SAK's. I have a hiker, and like the farmer, it's a great woods knife but I just don't need a saw in everyday suburban life.
My general rule of SAK's is, if the tool's on it have not been used in a month, then I need a simpler SAK. A once a year tool use is not enough for me to carry it. At the present, I am on vacation in Key West for a week, and my only knife is a recruit that I mailed down to myself. So far, it's slice limes for gin and tonics, diced up anchovies for a salad, and popped open some cold ones for family members. Yet the two layers fit light and easy in tropic weight shorts. A bantam would have done as well, but since this in my only knife for the whole stay, I liked the idea of having the extra knife blade on hand. Today we're going out fishing, and the recruit will have to earn it's way.
Carl.