What is a Bag of Devouring's Storage Capacity for Living Creatures?

Question

Page 153 DMG:

Bag of Devouring

This bag superficially resembles a Bag of holding.

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Inanimate objects can be stored in the bag, which can hold a cubic foot of such material.

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When part of a living creature is placed in the bag, as happens when someone reaches inside it, there is a 50 percent chance that the creature is pulled inside the bag.

Bag of Holding

This bag has an interior space considerably larger than its outside dimensions, roughly 2 feet in diameter at the mouth and 4 feet deep.

Storage Capacity

As the bag superficially resembles a Bag of Holding, that means it is 2 feet in diameter at the mouth and 4 feet deep. Internally, it is explicitly stated that it holds up to 1 cubic foot of inanimate objects.

Given these measurements, what is its internal storage capacity for living creatures that are pulled into the bag, and how does its 2-foot diameter mouth change (if at all) depending on creature size?

A Medium sized creature could fit through a 2-foot opening, but what happens when a Gargantuan Brontosaurus sticks its head into it?

Answer 1

Size of the creature does not matter

DMG, page 153:

When part of a living creature is placed in the bag, as happens when someone reaches inside it, there is a 50 percent chance that the creature is pulled inside the bag. A creature inside the bag can use its action to try to escape with a successful DC 15 Strength check. Another creature can use its action to reach into the bag to pull a creature out, doing so with a successful DC 20 Strength check (provided it isn't pulled inside the bag first). Any creature that starts its turn inside the bag is devoured, its body destroyed.

There is no word about size of the creature. So RAW it's no matter.

It's a wondrous item, friend, standard measurements here do not rule :)