[Moonsu] Better GUI for Sophisticated Backpacks

# A fully customized GUI that goes with the backpacks!  _**(Check the images tab)**_  ### Link mod!: [Sophisticated Backpacks!](https://www.curseforge.com/minecraft/mc-mods/sophisticated-backpacks) ### Can i use for my Modpack? **Sure! no problem, but I would appreciate if you could leave credits.** Any questions or suggestions can be left in the Official Discord: [Discord](https://discord.gg/bGfyh9EXrT)!