Before the Postal Storm Hits...What to Do Now

2. The more drastic change is to shift from a flat-size catalog to a letter-size catalog, he says. “Slim Jims” are generally 6-1/8” x 10-1/2”; “digest-size” is generally 5-1/4” x 8-1/4”. For a number of years — and most notably, of course, in the PRC’s recommendations, letter size Standard Mail gets a significant price break because the USPS has made considerable investments in equipment that automates the processing of this type of mail. But again, in order to qualify for letter size rates, catalogs must weigh less than 3.3 oz.