I love the features of this mod, like items automatically going into it but I dont want an extra backpack. Does this mod integrate with facepunch's backpack?

If you use the plugin you get more functionality but you only ever get one backpack, The plugin enables you to give more slots/rows either as rewards using other plugins or as default.

Thank you for your reply. What are the settings? I have it all default and when I open backback from facepunch there are no buttons/sort etc, and when I type /backpack it opens a separate backpack. Sorry, thanks for any help.

I have used the plugin since it came out years ago and have no info on the (recent)  FP one. I use the (bound) b key to open the backpack and esc to close it. I use the gui and i manually sort the backpack although there are plugins that will do that, I assign player slots/rows according to the amount of time they have spent on the server (PlaytimeTracker and PlayerRankings)  , the default is 6 slots to start off with (which they gain after 1 hour on the server) and progresses to several pages.

This plugin currently has no integration with the vanilla backpacks. There are other plugins which function more like vanilla backpacks, such as Bag of Holding.