When you buy a two pack of why does it say shake well on the bottles but not itself?

It's a good question! You're right, it seems a bit odd. Here's why you'll find "shake well" on individual bottles of a two-pack, but not usually on the packaging itself:

* Individual Use: The "shake well" instruction is primarily for the individual user before consumption. Each bottle might contain ingredients that need to be mixed before use, like a suspension of particles or a layered drink.

* Packaging Doesn't Require Mixing: The packaging itself doesn't usually contain the actual drink components. It's just a container for the bottles. There's no need to shake the box or plastic wrap before opening.

* Clear Instructions: While the packaging might have other instructions (like storage, ingredients, or expiration dates), putting "shake well" on the packaging would be redundant. It's assumed you'll read and follow the instructions on the individual bottles.

So, while it might seem a bit off, it's simply a matter of practicality and avoiding unnecessary information on the packaging.