Designed to fail

Rogers Sugar packaging

They say not to, but you know that most of the customers will pick up this bag of sugar by the fold. So if you know that customers are going to pick up the bag by the fold, and the fold is a weak point, you have two choices.

1. Improve the strength
2. Warn people not to pick up the bag by the fold.

The first would be the rational thing to do, because you obviously know that is how customers are picking up the product. But it is cheaper to print "Please Do No Pick Up By The Fold" than improve the quality of the glue. (And I'm not even going to talk about the fact that the notice is in English only, while I'm pretty sure that it should by bilingual.)