Anti-Personnel Pocket is a gear perk that lets you carry more claymores, proximity explosives and C4. It suits players who like setting traps and blowing things up.
Your carry limit for placed explosives goes up, so you can rig more traps on a patrol route or blow more targets per trip.
Wear one of the gear pieces that carry it: Tactical Vest. Each piece only takes one body slot, so plan around the other perks you want.
Worth it if you lean on traps and demolition. If you rarely place explosives, another chest perk will help more.