Just Backpacks [DISCONTINUED]
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Changelog
V3.1.0 - Upgrade Kit System (February 2026)
This update introduces the Upgrade Kit System, replacing the per-tier crafting recipes with a progression-based upgrade mechanic that preserves your backpack's contents across every tier transition.
🔧 Added — Upgrade Kit System
- Upgrade Kits: Five new items — Copper, Iron, Gold, Diamond, and Netherite Upgrade Kits — allow upgrading a backpack to the next tier without losing its contents.
- Usage: Place the backpack in your offhand, hold the Upgrade Kit in your main hand, and interact (Right-click / Long-press).
- Tier-locked: Each kit only works on its matching tier. You cannot skip tiers.
- Recipes: Kits are crafted at the Crafting Table. The Copper Kit requires 4× Copper Ingots; other kit recipes follow the same material pattern.
✨ Added — General
- Item Lore: Backpacks now show their unique ID, owner name, and current tier directly in the item tooltip.
- New Languages: Added Italian (
it_IT), Korean (ko_KR), Polish (pl_PL), and Turkish (tr_TR). The addon now supports 13 languages total.
⚡ Improved
- Simplified Crafting: Removed individual crafting recipes for tiers 2–6. The Leather Backpack remains the only directly craftable tier.
Downloads
- Just Backpacks V3.1.0.mcaddon (35.11 KB)
Hey everyone!
I accidentally overwrote the description by mixing it up with another project I'm working on (an improved version of this addon).
**The description you see above does NOT match this addon.**
It's just placeholder text from the other project – please ignore it completely!
**The addon itself is unchanged:**
- Features and files are exactly the same as the previous version.
- No updates, additions, or removals happened from this error.
I'll fix the proper description soon. Sorry for the mix-up! 🙏
If you have questions, issues, or feedback, please leave a comment here on the project page – that's the best way to reach me right now. Thanks for your patience and for using the addon! ❤️
~ Memorie Studio
Don’t worry, you’re probably not the only one! Feel free to tell me what’s happening to you. I’ll do my best to help or fix it soon 👍
Yes, this is a known issue with the dimension transition system. The bug can cause items to temporarily split or disappear when crossing into the Nether or The End, and it affects versions 26.1 and 26.2 as well.
For now, the best workaround is:
1. Close your backpack (switch to another item) before entering any portal.
2. Wait a few seconds after arriving before opening it again — this gives the save system time to sync.
I'm investigating this and will address it in a future update. Sorry for the inconvenience, and thanks again for taking the time to report it! 🙏
I've fixed this in v3.0.2 by centralizing all saves to the Overworld and adding tickingareas to keep the data synced globally. Update the pack and your items will be safe everywhere!
I just released V2.0.0 which completely rewrites the core engine to fix this.
1. TPS: It no longer saves to disk when unequipping. Instead, it teleports the entity to a ticking area (Safe Zone), making usage instant and lag-free.
2. World Size: It now only saves to a physical structure file when the player disconnects.
3. Safety: Keeping the entity alive in memory prevents the duplication glitches associated with constant despawning/respawning.
Hope you give it a try!