An easy way to create grid/tetris style inventories on Roblox.
Head to the releases page and download the latest gridpack.rbxm file. Then insert the downloaded file in Roblox Studio by right clicking on ReplicatedStorage and choosing "Insert from File...".
If you use rojo or similar you can add the GridPack package by getting the latest release here.
Check out the guides on the docs website to create your first project and get started!