The USPS has experimented with different booklet sizes over the years. In the 1990s, you could get a book of 10 stamps. Some holiday books come in a sheet of 20, but without the booklet fold. The 20-stamp book is the current champion, partly because it’s easy to price and fits in a standard envelope pocket. But who knows? Maybe in ten years, we’ll have books of 25. Change is the only constant, even with stamps.
Here’s a fun fact: a book of stamps from 1970 only had 6 stamps. That’s because stamps cost way less back then, so a book was cheaper. Today, with higher prices, 20 stamps give you a balance of affordability and usability. It’s like inflation in reverse—you get more stamps, but they cost more overall.
