Backpacks and inventory

Inventory calculator

How the inventory works

• The bag has 48 slots. A backpack in the backpack equipment slot adds rows, up to 96. Taking a backpack off when the extra slots are full drops what does not fit.
• 32 slots are free. Perks, armor, mods and some food add more free slots.
• Every slot in use above your free slots is encumbered and costs 1.1% of your movement speed. It counts filled slots, not weight, and not where they sit in the grid.
• A full 96-slot bag with nothing that frees slots is 64 encumbered slots: 70.4% slower. With Pack Mule at rank 5 it is 8 slots, 8.8%.

Backpack sizes

Each backpack comes in qualities 1 to 6. The first number is the slots it adds, the second your total with it on. A bigger backpack at Q1 beats a smaller one at Q6.

Backpack	Q1	Q2	Q3	Q4	Q5	Q6
Small Backpack	+2 50	+4 52	+6 54	+8 56	+12 60	+16 64
Medium Backpack	+18 66	+20 68	+22 70	+24 72	+28 76	+32 80
Large Backpack	+34 82	+36 84	+38 86	+40 88	+44 92	+48 96

What frees slots

Source	Free slots
Armor
Lumberjack Outfit	+1 at Q1 to +10 at Q6
Scavenger Outfit	+1 at Q1 to +10 at Q6
Nomad Outfit	+1 at Q1 to +10 at Q6
Armor mods
Armor Pocket Mod	+1 per armor piece it is in
Armor Double Pocket Mod	+2 per armor piece it is in
Armor Triple Pocket Mod	+3 per armor piece it is in
Armor Quad Pocket Mod	+4 per armor piece it is in
Perks
Pack Mule	+4 / +12 / +24 / +40 / +56 (ranks 1 to 5)
Books
The Fireman's Almanac: complete set bonus	+45 Fire Adrenaline: The smell of smoke in the burnt forest and wasteland gets your adrenaline pumping.
Night Stalker Vol 4	+27 Thief Adrenaline: At night when the adrenaline is rushing you will never feel the weight of your burdens.
Food and drugs
Chicken Nuggets	+48 while the buff lasts
Steroids	every slot free while the buff lasts

Pocket mods go in armor mod slots; the outfits are the body armor pieces of their sets.

Sandbox option: Encumbrance Slots

Controls the number of encumbered backpack slots. Values are Disabled (no encumbrance) to Full (maximum encumbrance). Default uses XML config values. It scales the 32 base free slots:

Crafting backpacks

Backpacks are unlocked by the Backpacks crafting skill (0 to 100), raised by reading Pack Rat Magazine. Each Pack Mule rank also makes those magazines easier to find. The ingredients grow with the quality you craft:

Small Backpack

Workbench · 10 s · unlocked at Backpacks skill 5, Q6 at 30

Ingredient	Q1	Q2	Q3	Q4	Q5	Q6
Sewing Kit	1	2	3	4	5	6
Cloth Fragment	5	10	15	20	25	25
Forged Iron	–	–	–	1	3	5

Medium Backpack

Workbench · 30 s · unlocked at Backpacks skill 40, Q6 at 65

Ingredient	Q1	Q2	Q3	Q4	Q5	Q6
Sewing Kit	7	8	9	10	11	12
Leather	25	30	35	40	45	50
Forged Iron	5	10	15	20	25	30

Large Backpack

Workbench · 60 s · unlocked at Backpacks skill 75, Q6 at 100

Ingredient	Q1	Q2	Q3	Q4	Q5	Q6
Sewing Kit	13	14	15	16	17	18
Leather	50	55	60	65	70	75
Scrap Polymers	20	35	50	65	80	95
Forged Steel	5	10	15	20	25	30
Legendary Parts	–	–	–	–	–	1

Finding backpacks

• Small Backpack: Savage Country Box (9.4% per open at loot stage 50). Where to find it.
• Medium Backpack: Savage Country Box (6.0% per open at loot stage 100). Where to find it.
• Large Backpack: tier 3 loot, which only shows up from loot stage 146 (see loot stage).

No trader stocks backpacks in 3.3: craft them or find them.

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