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Fallout Wiki

What are you, part pack mule? Though those favoring heavier weapons and armor are likely to take this perk on general principle, it's also hugely beneficial to scavengers; spend more time in the wilderness gathering loot to sell or trade! Carry a greater complement of killing equipment! And at higher levels, have some way of easily maneuvering back to safety without dropping your ill-gotten gains.Fallout 4 Vault Dweller's Survival Guide p. 13

Strong Back is a perk in Fallout 4.


Increased Carry Weight, including bonuses to Action Points and fast travel when overencumbered.


Rank Requirements Description Form ID
1 STR 6 What are you, part pack mule? Gain +25 to carry weight 0004B24E
2 STR 6, LVL 10 You now have +50 to carry weight. 00065E5B
3 STR 6, LVL 20 When overencumbered, you can use Action Points to run. 00065E5C
4 STR 6, LVL 30 (Normal mode) When overencumbered, you can fast travel.

(Survival mode) When overencumbered, you will not become injured.

5 STR 6, LVL 40 Far Harbor (add-on) When overencumbered, running costs 50% less action points. xx0423A3


  • With rank 3 of this perk, running while overencumbered consumes AP similarly to sprinting. Because of this, increased Endurance also lowers the AP drain, just like it would for sprinting.
  • Rank 3 of the Moving Target perk also takes effect with the ability granted by rank 3 of this perk, reducing the AP drain of running while overencumbered. It also combines with rank 5 of this perk multiplicatively, further reducing (but not negating) the AP drain.
  • On Survival mode, rank 4 will negate damage taken from being overencumbered.
  • Rank 5 requires the Far Harbor add-on.


  • PCPC Xbox OneXbox One Playstation 4Playstation 4 A bug with rank 3 will use fusion core energy, since it still drains AP. This will quickly use up any fusion core energy from your suit, but only when moving. As mentioned above, Moving Target and rank 5 of Strong Back will reduce the AP drain, but AP drain on moving can never be totally negated, and thus will still continually drain cores.[verification overdue]
  • PCPC Playstation 4Playstation 4 The help text in the perks screen incorrectly states the Normal mode effects for rank 4 even when playing in Survival mode. [verification overdue]