If the PCs want to take all the armor from the acolytes, prelate, and champion with them it will take 1 minute per set of armor to take it all off the fallen foes. That is 18 sets of chainmail armor, although the champion's armor is already pulled apart from the bear eating him, so let's say 30 seconds to get the rest off of him. The prelate's armor is more intact.
There are five PCs, Aureus, and the four other NPCs, so each character could remove one set of armor. However, the fallen cultists are spread around the temple so it will take time to move to each one and deal with scattered weapons and shields, so let's say it takes three times as long for each set of armor.
There is also the four sets of armor and shields left with the fallen cultists on the first level of the temple. Aureus has their daggers, flasks of acid, flasks of unholy water (†), torches, and unholy symbols (†) in her mundane pack and Brutus claimed one of the heavy maces.
The two handy haversacks can hold up to 120 pounds each, but the PCs have to take into account the gear already in them. Each set of chainmail weighs 40 pounds. Each heavy mace weighs 8 pounds and each light steel shield weighs 6 pounds. Each dagger weighs 1 pound. There are three light crossbows, which weigh 4 pounds each.
Hmm, can you even get a shield into a handy haversack?
† To be disposed of later.