Do you want a backpack addon that works very similar to the Backpack mods from java? Or do you want to carry alot of things but don't have anymore space in your inventory? This addon is just for you!
If you have played any backpack mods from Java, you might be familiar to how this addon will work.
Recipes:
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Small Backpack [16 slots]:

Medium Backpack [32 slots]:

Big Backpack [42 slots]:

Big Backpack [63 slots]:
Do not upgrade existing BIG BACKPACK with items inside, ITEMS WILL NOT CARRY OVER!

How to Use:
First, craft the backpack, then hold it on your hand, you will notice a red thing will pop-up next to the icon. Holding the backpack will not let you hit anything or interact with blocks.

Now, if you are on a PC, just right-click while the backpack is on your main hand, and you can now access the backpack's inventory.
If you are on mobile, simply tap the open button, or long-tap the screen while holding the backpack.

PC and Mobile have the same Backpack GUI:

The items are saved per backpack, so you can put items in the backpack and share the backpack with your friends.

Backpack Commands:
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OLD Commands
These commands are very useful when you want to retrieve a lost backpack.
- bp reset - Type this while holding your backpack to reset it.
- bp update - Hold your old backpack (backpack created before V3) to reset
- bp central - Give the location of the backpack central. (requires op tag)
- bp move - Move the location of the backpack central. (requires op tag)
- bp drop <backpack id: number> - Get the contents of a backpack. (requires op tag)
- bp view <backpack id: number> - View the contents of a backpack (requires op tag)
- bp list - List all backpack IDs (requires op tag)
Backpack Central is where all the main backpacks are located.
When using the backpack commands, do not put a "/", for example, just type in chat "bp reset" or "bp drop 1028"
Improved Commands
- !bps reset - Reset the backpack item you're holding.
- !bps list - Show the list of backpacks.
- !bps clear bp - Deletes all backpacks and item recovery.
- !bps see <ID:int> - See specific backpack items.
- !bps retrieve <ID:int> - Retrieve backpack items.
- !bps set <ID:int> - Manually set your backpack ID.
- !bps delete <ID:int> - Delete backpack and recovery items.
When using the backpack commands, do not put a "/" instead put "!", for example, just type in chat "!bp reset" or "!bp see 1028"
Backpack Recovery System:
The most important function of the improved backpacks the Recovery System!
Installation:
- Make sure to turn on the backpack resource pack in your world if you are using this addon.
- As always, backup world first if you are updating from an older version of the backpack just to be safe.
- Don't forget to activate the experimental functions:

ENJOY :D
My Twitter: @Dewdimpple
Also, join my Discord Server for addon problems or addon updates!
Updated on December 06
- Updated to 1.20.50
- Added new command !bps list
Changelog for November 26 / Old Update
Bug Fixes:
- The backpack command list no longer appears when sending chat messages.
Changelog for October 19 / Old Update
- Updated to support Minecraft 1.20.40.
- Fixed when going to the menu it loads for a long time.
- No backwards compatibility 1.20.30 and below.
Changelog for October 01 / Old Update
1.20.30.X Version 4 (Optimized):
- Optimized version.
- This breaks when there is a new minecraft update.
Submission Page Update:
- Remove stable build due to a lot of bugs.
Changelog for August 13 / Old Update
1.20.12.X Version 2.7:
- Fixed addon stop working during multiplayer when player leaves.
Changelog for August 09 / Old Update
1.20.12.X Version 6:
- Improved for multiplayer play by distributing load per tick
- Changed how inactive backpack despawns
Changelog for July 14 / Old Update
1.20.10.X Version 1:
- Added support for MC 1.20.10.X
- Fixed item list not updating
Changelog for June 29 / Old Update
V 1.20.0.X:
- Added support for 1.20.0.X
- Fixed download link
- Added resource and behavior link
Changelog for June 09 / Old Update
- Added support for 1.20
- Fixed download link
Changelog for May 17 / Old Update
- Support for Minecraft 1.20
Changelog for May 01 / Old Update
- Fixed addon for Minecraft 1.19.80
- Some code fixes
Changelog for March 17 / Old Update
- Fixed addon for Minecraft 1.19.70
Changelog for February 09 / Old Update
- Fixed addon for Minecraft 1.19.60
- Merged Server version with Main version
Changelog for January 11 / Old Update
- Added a fix when using the addon inside an aternos server.
Changelog for December 01 / Old Update
- Fixed backpack can still be opened when the backpack item is dropped.
- Putting the backpack item in itself will now drop the item like normally.
- Fixed Manifest for 1.19.50
Changelog for November 18 / Old Update
- Updated GameTest code to work with 1.19.40
Changelog for October 28 / Old Update
- Updated GameTest code to work with 1.19.40