- "The ammo bag is a portable bag, originally intended to allow soldiers to carry extra ammunition."
- —In-game description.
The ammo bag is a deployable piece of equipment that the player can use to replenish their ammunition reserves by interacting with it. Like in PAYDAY: The Heist, its rate of depletion is linearly proportional to the percentage of the weapons' ammo pools being restored.
Unlike the ammo bags of PAYDAY: The Heist which are deployed instantly, the bags in PAYDAY 2 takes a while to fully set up, leaving the player vulnerable for the entire duration of the placement.
The player can carry 1 extra ammo bag by unlocking the Ammunition Specialist skill, and then gain 2 additional uses (+200%) of each bag by acing the skill.
The basic ammo bag contains 3 uses (300%) for one weapon. Calculation is made in percentages, so no matter what weapon a player wields, the total ammo pool for that particular weapon is considered 100%, be it a fully loaded shotgun with 30 slugs or a fully loaded assault rifle with 150 cartridges.
This eases ammunition management on a team basis, as players will not use a full charge in order to replenish their ammunition, instead reducing the bag's remaining amount (a percentage) by the exact percentage taken. However, note that weapons with a small total ammo pool will take away a larger percentage from the ammo bag each time its ammunition is replenished. Players should take this into account when selecting their weapons, especially if their crew is going into a long heist without bringing multiple ammo bags.
Ammo bags will visually diminish as they are used. This can help give players the calculation of remaining ammunition.
- Note: The ammo bag will prioritize secondary weapons. If there is not enough ammo to fill both of your weapons, the bag will first refill your secondary and then your primary.