What is Pack It Up!?
Pack it up is a simple backpack mod that focuses on storage choices over a simple progression from small backpack to humongous backpack. There are tiers of basic pack, but there is also an array of specialized backpacks tuned towards certain item types, that can hold much more of that type of item.
Packs
Backpack
Your run of the mill pack. Holds 2 rows of any item.
Large Backpack
Larger basic pack. Holds 4 rows of items. All specialized packs derive from this.
Extreme Backpack
High Tier basic pack. Hold 6 rows of stuff.
Iron Armorpack
Small armorpack. Can be worn in the chest slot and provides 3 armor.
Golden Armorpack
Medium armorpack. Can be worn in the chest slot and provides 4 armor.
Netherite Armorpack
High tier armorpack. Can be worn in the chest slot and provides 6 armor and 2 armor toughness.
Blockpack
Holds blocks. Can store 3 rows of stacks of 256 blocks.
Orepack
Like the blockpack, but can only hold ore blocks, raw ores, and gems. Stacks to 256.
Enderpack
A portable ender chest. Links to the players normal ender chest inventory.
Plantpack
Holds 3 rows of flowers, saplings, logs, and other planty things. Stacks hold 256 items.
Magicpack
Holds 3 rows of Enchanted books, potions, and tipped arrows. Can hold up to 256 items, or 4x an items normal limit.
Lunchpack
Holds 3 rows of food items. Up to 256 per stack.
Toolpack
Holds 7 rows of tools and equipment. Anything that can be damaged.
Getting Started
To get started, craft a Pack Bench with some planks and some ladders (same layout as the smithing table recipe). The Pack Bench GUI also looks very much like a smithing table.
Craft up a Frame, as described in the wiki, and a Backpack Bag. Combine them in the table and viola! Your first basic pack. More advanced packs are combined with a more basic pack and the new bag, rather than a frame. You get to keep the old bag!