This is from Roll20 so Im going to assume is current and correct for 5E.
"This bag has an interior space considerably larger than its outside dimensions, roughly 2 feet in diameter at the mouth and 4 feet deep. The bag can hold up to 500 pounds, not exceeding a volume of 64 cubic feet. The bag weighs 15 pounds, regardless of its contents. Retrieving an item from the bag requires an action.
I know its clearly definiens that the bag is 64 cu. ft. and can hold 500 pounds, This meticulously requires the players and DM must book keep. Thats not something I'm interested in but I also don't want the party thinking this is a never ending well of storage.
Has anyone ever came up with another method/system for tracking contents, remaining space in a BoH? As in a small item takes up "x" amount of storage and cu. ft, etc? I underatand the opening is a 2' Dia so theres no need to discuss what can fit in it.
When I first read the rule, I immediately discarded the volume restriction. I can convert pounds to kg, I cringe at feet but... cubic feet? There is no way I will calculate the volume of an item to check if it can fit in the remaining volume. Metric system wizard lose 9.6 cm on their fireball's radius and move 14cm less each round than their imperial counterpart, I balance it by removing any restriction based on cubic feet.
More seriously, there is no way to be sure, by RAW, of how items are stored inside the bag. 64 cubic feet is a volume unit, and a halberd is 5 to 6 ft long but not very wide or deep. Its volume would feet easily because we don't know the inner dimension precisely. It could be 2x2x16ft for all we know. It could keep the form of the outer bag, so it would be a cylinder 1.75ft of radius and 7 ft deep. We can't know. So, maybe you could just keep track of the weight limit? The bag of holding allows you to carry 500 pounds "for free".