The Cubicle backpack hadn’t been released when I got my Moyu backpack, but honestly it looks like a direct upgrade. As someone who is not an 8 year old, the Moyu backpack is strangely small and uncomfortable to wear; I typically just hold it in one hand. The Cubicle backpack also seems to be small based on the pictures, but I like that the whole height of the backpack is used as potential individual cube storage space, rather than just the bottom section like the Moyu. The Cubicle backpack is also significantly cheaper, which assuming it’s a well made (or as well made at least) product, is a very nice bonus.
I’m not really sure why no one has made a cube-specific backpack that is comfortable, able to safely store individual cubes, and also useful for a full-size individual who also has other things to bring to these events beyond a handful of puzzles.