Generally, I'd prefer the pack size to stay the same, especially if it is something you buy often, so you know how long it will last, or how many people in the family it will cover.

But when it comes to junk food like chips, confectionery and franchise fast food... the smaller size portions would actually be a good thing. As it would cut down on the bad stuff like calories, fat, sugar and sodium. Unfortunately that will only go so far, because if it shrinks too much, you would then be more likely to buy two to satisfy your hunger.