Scavenger Sense is a gear perk that tags loot containers through walls. It makes it much easier to find crates in outposts and buildings, so you collect more materials and supplies on each visit.
Nearby containers show up through walls and floors. You stop missing loot hidden in side rooms.
Wear the Scrounger Helmet in the head slot. Gear perks are fixed to the piece of clothing that carries them, so you get this one by wearing that piece, not by unlocking it in a menu.
Strong for early material gathering. Once your weapons are kitted out, a combat head perk usually helps more.