From past experience, you’ll use all of a couple sizes very quickly, then you’ll use another couple of other sizes because you’ve not got the right ones by which time the rest will have ended up in a mixed up mess, but it won’t matter because you won’t be able to use them for,anything any time soon. Then when you do need a couple of screws of the remaining sizes you’ll not be able to find the box and when you are in the big shed you’ll see another selection pack and in spite of your previous experiences, partly because you can’t remember just exactly what size you do need, you’ll buy it and the whole process will start again.