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Bulk is still unguided. Knowing whether or not they could carry a key, potion, or backpack would be nice.
Unless the rules say somewhere that bulk is determined differently for NPCs, the rules on pg 272 state that "You can carry an amount of Bulk equal to 5 plus your Strength modifier without penalty ... You can’t hold or carry more Bulk than 10 plus your Strength modifier"So a creature with Str 1 is encumbered by 1 or more bulk but can carry 5 bulk. Tiny halves this. So via the RAW that seem very popular in this thread, your mouse familiar can carry a suit of studded leather with a 10 ft reduction in its speed, and a cat can probably manage breastplate. So I wouldn't worry too much about the things you list above.
Edit: forgot to halve for tiny.