Backpacked Up!

v0.9.4 — Curios integration, five new upgrades, performance

New: optional Curios API integration

When the Curios API mod is installed, backpacks can be equipped in a Curios back slot — no extra mods required, the mod works just as well without Curios.

• Backpacks render on your back in Curios slots, exactly like the vanilla chest-slot look.
• The backpack key (B) and all active upgrade effects now consider backpacks equipped in Curios slots, in priority order after the chest slot and before the offhand.
• The backpack menu stays open while the backpack is equipped in a Curios slot, and soul-bound backpacks keep the Curios drop rule (they never drop on death).
• The Curios dependency is declared optional, so nothing changes for players who don't use Curios.

New: five craftable upgrades

Five new upgrade scrolls can be crafted in a crafting table:

• Lumber Assistant — automatically stores wood you chop (and leaves) into the backpack.
• Mining Assistant — automatically stores mined ore into the backpack. Uses a mod-defined ores block tag that other mods can extend.
• Fishing Kit — automatically stores your fishing catch into the backpack.
• Hunter's Trophy — automatically stores mob loot (including ranged kills) into the backpack.
• Farmer's Harvest — automatically stores harvested crops into the backpack.

Block, mob, and fish drops are inserted straight into the backpack that carries the matching upgrade, merging with existing stacks; any items that don't fit stay on the ground.

Improved: performance and efficiency

• The active-upgrade lookup (vacuum + auto-feeding) is now cached per player and re-scanned at most once every 10 ticks instead of every server tick, with a cheap identity check that a backpack is still carried in between.
• Vacuum and feeding backpacks are now found in a single pass over the chest slot, Curios slots, offhand and inventory, instead of scanning once per upgrade.
• Drops are inserted into the backpack with batching — one write per pickup event instead of one per item.
• Placed backpacks copy and save their upgrade slots element-wise, avoiding list reallocation on every save.

Bug fixes

Fixed: Soul-bound backpacks survived logout while still on the death screen. The kept backpacks are now persisted into the player's NBT at death and restored on respawn or on the next login, so you no longer lose them if you log out before respawning.

Fixed: Auto-feeding could eat an item twice or lose the container. The feeding scroll now correctly handles the empty container handed back by Player.eat() (e.g. the bowl of a mushroom stew) — no more double consumption and the bowl is kept.

Fixed: Right-clicking a placed backpack while holding a non-backpack item now opens the backpack instead of trying to use the held item on it.

Fixed: Stale upgrade effects after respawn, login or logout. The per-player upgrade cache is invalidated on respawn, login and logout, so effects never act on a backpack the player no longer carries.

Fixed: Vacuum and feeding no longer act on a backpack that was moved or dropped mid-operation; the cache is refreshed when the backpack is no longer carried.