Iron Chests mod has chests for the various metals in vanilla minecraft with varying sizes!
In 1.13, the custom shulker boxes have been moved to their own mod: Iron Shulker Boxes
This mod is open source, and may be used in any modpacks.
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Minecraft: Java Edition
1.21
1.20.4
1.20.1–1.20.2
1.19.4
1.18.2
1.16.5
Platforms
Forge