Starfinder introduces "Bulk" — an easier system for calculating encumbrance. All listed equipment are now measured in "bulks", however, creature weight is still being measured in pounds. It becomes hard to decide, how fast you can carry a wounded mate (or maybe a dead body, who knows), since you can't measure a creature in "bulks". Sometimes the question might be more serious than just "how fast".
Let's take a specific example – a Ysoki Mechanic gets his Drone damaged and inactive, and want to secure it until repair. The Drone has "Hover Drone" chassis (see Core Rulebook, page 75 for details), thus, is a Tiny creature. According to the table 8-1 "Creature size" (Core Rulebook, page 256), "tiny" creatures are about 1–2 ft. height, 1-8 lb. weight. The "estimating bulk" chapter (page 167) says that one bulk weighs around 5 to 10 pounds, so a tiny creature should be 1 bulk in terms of encumbrance. Or more, since the same page says that "an awkward or unwieldy item might have a higher bulk". It is still unknown, what volume does the Drone have (is it 1 cubic foot or more).
So, the title question:
Ysoki can store up to 1 cubic foot of items weighing up to 1 bulk in total in their cheek pouches
My damaged Hover Drone is tiny, it is 1–2 ft. in height and 1–8 lbs. in weight. But how bulky is it? In other words, can I store it in my pouches? (Common sense dictates that it probably won't fit the Ysoki's mouth anyways, but let's stick to RAW.)
Best Answer
No (Probably).
Cheek pouches can only hold 1 cubic foot. Since 1 foot is the minimum length/height a Tiny creature can be (Table 8-1, p. 256 Starfinder Core Rulebook), it's likely the drone is too big.
Then you have to consider:
Ysoki have two cheek pouches with a combined volume of 1 cubic foot. Since the volume is divided between these pouches, it's extremely unlikely a ysoki can use up their cheek pouch volume with a single large object. Cheek pouches are designed to hold many small objects, not one really large object.
The drone would need to fit in the ysoki's mouth. Even with cheek pouches, that's extremely unlikely.
You might be able to convince your GM that your drone is compact enough to fit, but then you'd have to convince them that such a compact little drone is sturdy enough to hold weapons, armor, etc.