Not sure that design makes a difference, but I'm betting there's more variation in the Oberons than many of the others. Each hide is so different, and while I'm sure they go for as consistent a thickness as possible, there's got to be some that are heavier than others.
Mine is 9.4 ounces, Dragonfly Pond with corners--and that's pretty much the same weight we've seen on the others that have been posted.
Where did you get that weight for the Go! cover? Do have one that you weighed yourself? On both M-edge and Amazon website it says the M-edge Go! weighs 7.2oz. I'm expecting one in the mail any day & will weigh it & post.
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