Backpacks

**Backpacks** are equippable items that store other items when equipped in the offhand. First introduced in [[Prison],

To use a backpack, the player must hold it in their offhand (equip it in the inventory or press the 'F' key while holding), and it will automatically stash items that are picked up when the player's inventory is full. They may only store items that can be harvested from a mine, and will not function if placed somewhere in the inventory other than the offhand. A backpack's storage capacity can be increased by spending gold shards.

## Obtaining

   The Standard Backpack can be purchased from the Shard Merchant, located on Skull Island for 576 gold shards (9 stacks) each. Unlike most other wares sold by the Shard Merchant, backpacks are not considered contraband, meaning the player is not at risk of dropping it if they are killed.

### Crate-exclusive variants

Limited-time crates may have a special backpack as part of their item set, with a unique appearance and are enchanted with an exclusive rune.
These backpacks have the same storage and upgrade capability as the Standard variety, but their unique runes will provide the player with a helpful passive effect that assists their mining and money-making ability.

#### Halloween Backpack

   The Halloween Backpack was the first crate-exclusive backpack to be released, introduced with the Halloween Crate on October 28, 2022.

These backpacks possess the Pumpkin's Fortune rune which, when equipped, grants the player a small boost to their pickaxe's chance of activating Excavator, Trigger Finger, and Jackhammer when they mine blocks. Pumpkin's Fortune's level varies between 1 to 10, each level giving a **+2%** increase.

#### Christmas Backpack

   The Christmas Backpack was released with the Christmas Crate on December 23, 2022.

These backpacks possess the Santa's Sack rune, which will boost the sell bonus provided by the Greed upgrade upon selling items. Santa's Sack's level varies between 1 to 10, each level granting an additive **+1%** increase to the player's sell bonus provided by Greed.

#### Valentine's Backpack

    The Valentine's Backpack was released with the Valentine's Crate on February 11, 2023.

These backpacks possess the Dating Experience rune, which will increase the amount of experience given by the Wise upgrade. Dating Experience's level varies between 1 to 10, with each level bestowing an additive **+3%** increase to the bonus.

#### Imperial Backpack

    The Imperial Backpack was released with the Imperial Crate on April 21, 2023.

These backpacks possess the Bushido's Mettle rune. When a hotstreak is active, there will be a chance for mana to not be consumed upon each mana tick. Bushido's Mettle's level varies between 1 to 10, with each level bestowing a **+4%** increase to the bonus.

#### Celestial Backpack

    The Celestial Backpack was released with the Celestial Crate on June 9th, 2023.

These backpacks possess the Celestial Grace rune that, when triggered, will instantly fill the backpack's storage with the most valuable block from the player's mine. The level of Celestial Grace varies between 1 to 10, affecting the chance of activation through the formula ***tier / 100,000***.

#### Voltage Backpack

    The Voltage Backpack was released with the Voltage Crate on August 11th, 2023.

These backpacks possess the Energetic Endurance rune (misspelled in-game as 'Energectic Endurance'). If the player is mining non-stop, they will recieve a small, temporary sell bonus increase every 5 minutes. These bonuses stack additively up to 20 times, provided the user mines consistently for up to 100 minutes to reach the maximum bonus. If 10 seconds pass without mining any blocks, one stack will be subtracted.

```
The level of Energetic Endurance varies between **I** (1) to **X** (10), which determines the boost amount per stack at ***0.5% × tier***.

```

## Upgrading

Right-clicking with a backpack in the offhand will show the upgrade menu, where players can exchange gold shards in their inventory to increase the level of their backpack.
Every upgrade applied to a backpack will expand its capacity by 250, with the gold shard requirement steadily growing per level.
All backpack varieties are initially obtained at Lvl. I (1), with 500 item slots. There is no limit to the amount of upgrades that can be applied to a backpack.

Standard and crate-exclusive backpacks have the same upgrade costs.

*Upgrade costs sourced by players WheezeMachine, HavenTheJade, and David243p*

## See also

* Gold Shards
* Contraband