What should I fill all my Shulker Boxes with? (Minecraft General)

I was really lucky and came across an end city without much exploration. I had a looting 3 sword on me and managed to get 17 Shulker Shells, Enough for 8 Shulker boxes. I've already decided the red one in my off-hand should be for potions. What should I put in the other ones? Thinking of a few for basic mats for building and maybe one for redstone stuff. Also I found 2 Elytra so that's really nice!
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