This mod adds 5 items.

• A small backpack, that has 9 slots.
• A medium backpack, that has 18 slots.
• A large backpack, that has 27 slots.
• A ender backpack, a backpack that lets you access your ender chest from anywhere!
• A global backpack, a universal inventory that is only connected with anyone that has this item!

It also adds an enchantment!

• Capacity, an enchantment that increases your backpack's storage by 9 additional slots per level! Can be applied on medium and large backpack only.

Write /polymer generate command. Resource pack will be located in your server folder as polymer-resourcepack.zip.

1. Build your java resource pack with polymer.
2. Convert it to a bedrock resource pack using tools like java2bedrock.sh.
3. Follow the guide on Geyser for bedrock edition players to load the pack.
4. Optionally add the language files to Geyser for localization, follow the guides here.

Note: 1.21.2+ Geyser doesn't have support yet.