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I recommend making a copy of the BackpackPlus folder before updating the plugin Remember to change only the .jar file and do not delete the BackpackPlus folder.
If something doesn't work as it should report the error on discord

This adds backpacks to your Minecraft server. By default, there are three types of backpacks: Basic, Golden, and Diamond, each with a specific number of slots that you can modify. You have full configuration options.