Playboy issues vary in weight considerably. Even copies of the same issue can vary depending on the advert inserts. These additional uncounted pages of adverts were added to the magazine in a geographically targeted marketing approach.
I've also seen copies of later issues, to which this does not apply—but still there is a weight variance. I put this down to copies being printed in different locations using marginally different paper—which can also sometimes even have a slightly different look.
The approximate weight of most issues is indicated within it's details page. Our packing material for a single issue weighs 115g.