The backpack in Fallout 76 serves a precious function in that it can increase your carry weight. In addition, you can add Mods to it to provide additional benefits to your character. One of those mods, The Chemist's Backpack Mod, reduces the weight of all Chems by 90%. However, this Mod does not stack with other Perks that provide the same benefit. Still, this Mod is invaluable, primarily if your character uses a build that thrives on using Chems, which will save you valuable carrying weight. Here's where to get the Chemist Backpack Mod in Fallout 76 — and how to apply it.

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Where To Get The Chemist Backpack Mod In Fallout 76

Buying the Chemist Backpack Mod from Minerva in Fallout 76

Getting your hands on the Chemist Backpack Mod in Fallout 76 is a bit of a treasure hunt. There are only two places you can find it:

  • Mortimer: You will find him at The Crater and can purchase the Mod for 350 gold bullion from him. However, for Mortimer to appear in The Crater, you must have a reputation with the Raiders Friendly or better and complete the 'Secrets Revealed' side quest.
  • Minerva: You can purchase this Mod from her when she is selling items from your Stock #1 inventory for 263 gold bullion. Inventory #1 will be sold by Minerva from May 27 to May 29, 2024, at The Foundation. She'll be standing outside The Foundation gates, so use the exterior fast travel point. In addition, you can likely buy it during her big sale at Whitespring from June 20 to June 24, 2024.

Bethesda gives no official schedule for when and where Minerva will be. This means that the above dates are an estimation based on her weekly schedule, how she rotates her stock every week, and the dates Minerva has already completed in 2024. Minerva has 24 different inventories that she sells, starting at #1 and ending at #24. Minerva's Emporium happens from Monday to Wednesday for the first three weeks of the month. She then sells all three previous inventories, Minerva's Big Sale, on the fourth week of every month. However, this sale happens from Thursday to Monday instead. Each week, the inventory will progress by one until it hits #24, and then it will start over at #1 again.

How To Craft The Chemist's Backpack Mod

Adding Chemist's Mod to Backpack in Fallout 76

Once you've acquired the knowledge of the plan, you'll need the following crafting materials to create the Chemist's Backpack Mod:

  • Copper x 2
  • Plastic x 6

To apply the Chemist's Backpack Mod in Fallout 76, you must use an Armor workbench to apply the Mod to your backpack.