Dyeable and upgradeable vanilla-friendly backpacks!
Shaders: Photon Shader
Shaders: Complementary Shaders - Reimagined
Shaders: BSL Shaders
Shaders: Super Duper Vanilla
The Small Backpack has 3 total slots and the Ender Backpack is linked to your actual Ender Chest.
Each one has 9, 18 and 40 slots respectively.
(Ender Backpacks doesn't support dyes)
Use this as a guide if you decide to use one of the custom models for your custom backpack