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There is no moment of horror quite like opening a shipment of dewars to discover that one has shattered in transport. A close second to that is opening a shipment to discover that it isn't what you asked for which is what happened here. Functionally, they're identical to the normal 665ml "Rugged" FMJ Stein of Science except that the base has a no-slip silicone ring; cosmetically, metal jacket has a textured finish to it. Yes, yes...we've all already made the jokes about it being ribbed for pleasure.
I have used a ruggedized dewar with cushioning silicone resin that runs all the way to the top through the jacket forming a lip at the top. While this makes it more durable, it is also a little bit larger & heavier. It will take more abuse than the normal 665ml, but it is still a dewar so treat it kindly.