I really hate all the bags of vegetables in the supermarket that you are supposed to steam in the bag.
1) They're twice as much money as normal vegetables
2) You can't decide how much of the vegetable you want--you are essentially forced to use the whole bag. I prefer to use a little bit of several different vegetables rather than a whole giant bag of, say, asparagus.
I know, I could just not buy it. And I don't, believe me. But when 75% of the vegetables in the aisle are taken up by the steamfresh bags, then there isn't much room left over for the frozen veggies I actually want to buy. So I'm constantly unable to get the vegetables I really want.