Skilling backpack

The skilling backpack is an item that can be earned in several forms as a reward from the Boat to the Arc event of the Port Sarim Invasion. This item can be obtained by claiming it from the reward chest located next to Seasinger Umi. It is also rewarded automatically during the Return of the Pack event on treasure hunter (if not previously obtained) or (if already owned) will be upgraded to a new version with additional benefits, including all those of the highest-tier from the Boat to the Arc event.

Originally, the backpack could be upgraded based on personal and community progress within the Boat to the Arc event. Both personal progress and the community progress must have reached the threshold to receive the reward, with the latter having reached 100%. This means that the backpack's variant is dictated by personal progress. It comes with charges based on the threshold the player has achieved and cannot be recharged. (See table below for personal progress and corresponding item variant).

During the Return of the Pack promotion, opening Treasure Hunter will automatically award this item, replacing any previous versions obtained from the Port Sarim invasion. Any remaining charges are carried over, and the updated version will give the highest-tiered benefits, regardless of the player's original variant (which was based on personal progress in the Boat to the Arc event).

The experience boost is seen as a buff 'Skilling Backpack XP Boost'. Experience bonus is calculated off the base experience and stacks additively with both effects from Advanced pulse cores. If the player unequips the backpack after receiving the buff, the buff persists but doesn't give bonus experience until the backpack is reequipped. The buff timer continues to count down while the player is logged out.

Item Variants
Originally, the skilling backpack had multiple variants, based on the player's personal progress during the Port Sarim Invasion "Boat to the Arc" event. After the Return of the Pack treasure hunter promotion, it will be of the highest tiered variant listed in the table below.

Port Sarim Invasion version

 * Advanced pulse core
 * Large prismatic lamp
 * Magic notepaper (x100)
 * Medium dungeoneering token box
 * Prismatic large fallen star
 * Prismatic small fallen star
 * Royal battleship kit (x2)
 * Small prismatic lamp

Return of the Pack version
Rewards are now categorised into Consumables, Proteans, and Skilling Helpers. Players may choose to receive rewards from any one of these categories, or rewards from all categories (default) by right-clicking and choosing the "Attune" option on the backpack.

Consumables

 * 2 ancient relics
 * 2 royal battleship kits
 * 2 summer piñatas
 * 1 medium prismatic lamp
 * 1 small dungeoneering token box

Proteans

 * 50 protean bars
 * 50 protean cogs
 * 50 protean hide
 * 50 protean logs
 * 50 protean memories
 * 50 protean planks
 * 50 protean traps
 * 5 protean powerups

Skilling Helpers

 * 3 portable braziers
 * 3 portable crafters
 * 3 portable fletchers
 * 3 portable forges
 * 3 portable ranges
 * 3 portable sawmills
 * 3 portable wells

Bugs
The top version of the backpack gives 3% experience boost instead of 5.

Trivia

 * Wearing the backpack causes other players who were also wearing one to appear as blue dots on the minimap, just like when wearing the same Team cape.