Sack of Sacks

The Sack of Sacks is a SkyBlock Menu Upgrade in the bottom right of the menu once unlocked in the, used to store Sacks.

Obtaining
Like the Accessory Bag, the bag becomes larger as players progress in their  Collection.

Increasing Size
The size of the Sack of Sacks can be also increased by upgrading it in the Account & Profile Upgrades section of Elizabeth's menu. Each upgrade adds additional 2 slots to the Sack of Sacks. The costs and upgrade times are following:

Usage
The Sack of Sacks allows players to store different Sacks. With all Sack of Sacks Account & Profile Upgrades, it can contain up to 22 Sacks.

Note that backpacks and Trick or Treat Bags cannot be stored inside.