Pretty sure you're correct.
I picked these up off amazon for my new place a few months back. The build quality is quite nice, the gasket feels like it does a good job of sealing the containers. Had the smaller containers which I'm using for baking soda/baking powder drop from the top of the fridge without harm.
Only issue I've had is that the clips that hold the brown sugar bear/disc to the bottom of the lid of the brown sugar container have snapped, but I was just tossing the it into the sugar anyways. Built in flour sweeper is a surprisingly useful feature.
I only wish they had a larger size. For the record the largest container will take a 5 pound bag of flour as a perfect fit. Great set for an apartment dweller as I use it for AP flour, white sugar, brown sugar, baking soda, baking powder. Trying to remember what my 6th is used for but I believe it's powdered sugar, I don't use it often.
All the containers are basically designer built for those purposes, so they'll sink the standard grocery store sizes of the above products pretty easily. If I had a larger pantry I'd be able to shop at a wholesale place and wouldn't need these; but for those of us with limited capacity these are a great solution to keeping your dry baking goods safe, from the environment and from pests.