Project Zomboid Bag Guide (Build 42.19): Capacity, Weight Reduction & Run Speed
Build 42.19 · capacity, weight reduction, run speed, and felt-load examples. Mod bags are listed separately and not re-checked here.
How bag stats work
Four numbers matter for almost every bag:
- Capacity — max weight of items the container can hold (not the same as your character’s carry limit).
- Weight reduction (%) — when the bag is equipped (worn or held), contents contribute only
(100 − reduction)%of their weight to your encumbrance. A bag sitting unequipped in inventory does not apply reduction. - Weight — empty bag weight; always added while you have the bag.
- Run speed — multiplier on run speed while that bag is equipped. Most backpacks are below
1.0. This is separate from the “heavy load” penalties that come from total encumbrance moodles.
Run impact ≈ bag run speed × other gear modifiers × encumbrance moodles
Core vanilla bags (Build 42.19)
In-game display names. Full load felt assumes the bag is filled to capacity with ordinary items and is equipped.
| Bag | Slot | Weight | Capacity | WR | Run | Full load felt* |
|---|---|---|---|---|---|---|
| Fanny Pack | Waist (front or back; both can be worn) | 0.2 | 1 | 85% | 0.98 | 0.35 |
| Plastic Bag | Hand-held | 0.1 | 8 | 50% | 1.00 | 4.1 |
| Small Backpack (Schoolbag) | Back | 1.0 | 15 | 70% | 0.97 | 5.5 |
| Satchel | Satchel slot | 1.0 | 12 | 65% | 0.99 | 5.2 |
| Duffel Bag (+ police/SWAT/military skins) | Back | 1.0 | 18 | 65% | 0.95 | 7.3 |
| Hiking Backpack | Back | 1.2 | 20 | 75% | 0.96 | 6.2 |
| Big Hiking Backpack | Back | 1.5 | 22 | 80% | 0.95 | 5.9 |
| Military Backpack (ALICE) (+ army / camo variants) | Back | 2.0 | 28 | 85% | 0.94 | 6.2 |
| Military Duffel skin | Back | 1.0 | 18 | 65% | 0.95 | 7.3 |
*Full load felt = empty weight + capacity × (1 − WR/100). Rounded to one decimal. The military duffel skin is a duffel reskin (18 / 65%), not the ALICE military backpack (28 / 85%).
Best raw capacity
Military Backpack (ALICE) — 28 cap, 85% WR. Highest common wearable capacity in vanilla; also the strongest run-speed hit among standard packs (0.94).
Best “efficiency” mid-tier
Big Hiking often feels lighter fully loaded than a full ALICE (5.9 vs 6.2) because empty weight is lower, even though capacity is smaller.
Early reliable upgrade
Small Backpack (schoolbag) at 15 / 70% beats the old “60%” tables many guides still quote. Full load felt ≈ 5.5.
Hand-held stopgap
Plastic Bag is 8 / 50% (not 30%). It occupies a hand; weight reduction only applies while held.
Felt-load examples
Same 10 units of loot, bag equipped and those 10 units entirely inside it:
| Setup | Calculation | Felt weight |
|---|---|---|
| No bag (in main inventory) | 10 | 10.0 |
| Plastic Bag (50% WR, 0.1) | 0.1 + 10 × 0.50 | 5.1 |
| Small Backpack (70%, 1.0) | 1.0 + 10 × 0.30 | 4.0 |
| Duffel (65%, 1.0) | 1.0 + 10 × 0.35 | 4.5 |
| Hiking (75%, 1.2) | 1.2 + 10 × 0.25 | 3.7 |
| Big Hiking (80%, 1.5) | 1.5 + 10 × 0.20 | 3.5 |
| Military / ALICE (85%, 2.0) | 2.0 + 10 × 0.15 | 3.5 |
For a schoolbag filled to its 15 capacity: 1.0 + 15 × 0.30 = 5.5 (older “60% → 7.0” examples are wrong for 42.19).
Craftables, hydration packs, webbing
| Item | Cap | WR | Weight | Run | Notes |
|---|---|---|---|---|---|
| Sheet Sling Bag | 10 | 50% | 0.8 | 0.95 | Early craftable back bag |
| Tarp Sling Bag | 12 | 55% | 0.8 | 0.95 | Between sheet and hide sling |
| Hide Sling Bag | 14 | 60% | 0.8 | 0.95 | Hide / tailoring route |
| Hydration Pack | 12 items | 85% | 1.0 | 0.97 | Fluid tank 2.0 L water |
| Hydration Pack (camo) | 12 items | 85% | 1.0 | 0.97 | Fluid tank 3.0 L water |
| ALICE Belt and Suspenders | 6 | 80% | — | 0.96 | Webbing slot; max item size 1.3 |
| Chest Rig | 5 | 85% | — | 0.99 | Webbing slot |
| Garbage Bag | 20 | 50% | 0.1 | 1.00 | Hand-held bulk hauler |
Hydration packs: item capacity is 12; the old “1 L” claim is wrong. Water capacity is 2.0 L (standard) or 3.0 L (camo). Webbing empty weight is left blank where the item does not list a clear empty weight in the tooltip.
Practical loadouts
- Day 1: Sheet Sling Bag or Plastic Bag until you find a Small Backpack / Duffel / Satchel.
- Scavenge run: Best back pack you own + optional hand-held garbage/plastic bag for overflow. Expect the second bag to cost a free hand and its own run-speed hit if defined.
- Combat: Drop or stash the heavy pack before fighting if total encumbrance or the pack’s run speed is hurting you; keep essentials in fanny pack / webbing / pockets.
- Organized / Disorganized: Organized increases container capacity and Disorganized decreases it (bags and world containers; not your main inventory for Disorganized). Check the in-game container header after taking the trait rather than hard-coding a percentage from memory.
- Name trap: “Military” duffel skins are not ALICE packs. Look for the large ALICE model / “Military Backpack” name with 28 capacity.
Related location guides (still useful for spawn hunting, separate from these stat tables): Duffel bag locations, Military backpack locations, Traits & occupations.
Modded bags (unverified)
- True Actions / bag QoL packs — often change equip animations or allow extra worn slots; stats vary by mod version.
- AuthenticZ / Brita-style gear packs — may add military packs and vests; combined wear can trivialize encumbrance if stacked.
- “Bag of Holding” style cheats — deliberately break vanilla balance; keep them out of multiplayer unless everyone agrees.
When comparing mods to this page, match capacity, weight reduction, and run speed from the mod’s item tooltips—not marketing screenshots.
FAQ
What is the highest-capacity vanilla wearable bag?
Among standard loot backpacks, Military Backpack (ALICE family) at 28 / 85%. Crafted framepack tiers can go higher capacity (up to 35) with different WR and much higher empty weight.
Does wearing a bag slow me down even if I’m under my carry limit?
Yes, slightly. Equipped bags apply their own run-speed multiplier (for example ALICE 0.94, Small Backpack 0.97). Heavy-load moodles from total weight are an additional, separate penalty.
Duffel vs Hiking Backpack?
Hiking wins on paper: 20 / 75% / 1.2 vs Duffel 18 / 65% / 1.0. Full-load felt weight is also better on the hiking bag (6.2 vs 7.3).
Can I use two backpacks at once?
Vanilla: one worn on the back slot, plus another held in hand. Both can apply weight reduction when properly equipped/held. You cannot wear two back-slot packs without mods.
How much water does a Hydration Pack hold?
2.0 L on the standard pack and 3.0 L on the camo variant, plus 12 item capacity and 85% WR—not “1 L + 12” as older guides said.
Why did older guides list different weight reduction?
Many tables predate Build 42 values or mixed B41 memory with B42 items. Trust the in-game item tooltip over unversioned spreadsheets.
Numbers at a glance
- Use equipped capacity + weight reduction + empty weight + run speed together—not capacity alone.
- Headline 42.19 values: Schoolbag 15/70%, Plastic 8/50%, Hiking 20/75%, Big Hiking 22/80%, ALICE 28/85%.
- Hydration packs store 2 L or 3 L of water, not 1 L.
- Mod stats stay unverified until you read their tooltips or Workshop compatibility for your build.
- Stats can change in future patches—re-check tooltips after updates.
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