I couldn't tell you what website I was reading that referred to the aspect ratio as family friendly for Winnie the Pooh. It is 1.66:1 on BD though. Correcting the guide. Thanks for keeping me honest.

I also said the prior DVDs were 1.66:1 instead of 1.33:1. I wonder if I was thinking about a different film when I wrote that.

While the case gives no dimensions, Many Adventures measures to 1.66:1. It's narrow enough for vertical bars to show up on the sides of a 16:9 television with overscan. It seems like a compromise between the 1.33:1 aspect ratio used on the film's two previous DVD releases and the 1.75:1 ratio exhibitors in 1977 were instructed to project it in. We lose some of the frame height from the "full screen DVDs" but not enough to throw off compositions. Since these cartoons were produced over eleven years, it's not even clear if they stuck to one consistent ratio. It would be nice for Disney to shed some light on these decisions instead of just leaving us to guess and then second-guess when they change their policies.