Disclaimer: There are a few things you will have to update manually, since the plugin only adds missing config values, and does not replace your current ones.

- Bags can now be items/blocks instead of player heads, to allow usage of Custom Model Data.

- Lore entries "bound-to" and "bag-size" now support multiple lines.
(You add multiple lines the same way as described in the previous update)

- Crafting recipes have been given their own Custom Model Data entry, so you can have multiple bags with multiple looks.

- The update notifications no longer prompt you, if you're using a version higher than the latest.
(The Spigot API takes a little to update the versions, so if you update right after a release, the api still thinks the released version is older)

config.yml does not require you to manually update values, but lang.yml does, and recipes.yml if you wish to use Custom Model Data.

New/Updated config variables:
config.yml
lang.yml
recipes.yml
NOTE:
I've tested the bag-type ITEM the best I can.
If you discover any issues with it, please tell me in discussions or direct messages ^^