US Oreos come in packages of what I estimate to be 45 cookies. (The web site doesn't tell you this. It only says it contains 18 ounces, however many cookies that may be. I looked up on a nutrition site that one serving = three cookies, and Nabisco's nutrition info says there are "about 15" servings per container. 3 × 15 = 45)
Make of this trivia what you will.
Personally, I prefer the bag that tells me how many cookies are inside, rather than how much the cookies weigh. But maybe that's just me.
This message brought to you thanks to my sudden craving for Oreos (after spotting them at the supermarket), which I hadn't eaten in well over two (three?) years.