I assume the question is more to do with the bee's honey crop and its ability to carry nectar rather than its true digestive stomach, the ventriculus. The honey crop is to a certain extent elastic so you can't quote an absolute size but it can hold up to around 100 milligrams of nectar, although most bees will return to the hive with about 40 milligrams.
Are you looking for actual size or for capacity. I believe the capacity is are 1.5 quarts, but it has the ability to expand.
That depends on your stomach size and what foods you can tolerate better than others. I believe your question is on an individual basis.
An infant's stomach can hold about 2-4 ounces of milk or formula at a time, which is roughly the size of a small apple.
The size of a Bee depends what spices there in.
in the bee stomach
A worker bee is about 1 centimeter in size.
The average stomach capacity of a newborn is about 30-60 milliliters.
A bee entering your mouth is far more likely to sting inside your mouth or your throat. By the time it reaches your stomach it probably will be dead, and it certainly wouldn't survive once it reached the highly acidic stomach juices.
A newborn's stomach capacity is small, about the size of a cherry. This means they need to eat small amounts frequently, typically every 2-3 hours. Their feeding schedule and nutrition needs are influenced by this small stomach capacity, requiring frequent feedings to meet their energy and nutrient requirements for growth and development.
a matter of size
A bee has one digestive stomach and a crop, sometimes called the honey stomach. The crop is where nectar is stored while it is being taken back to the hive and is not strictly a part of the digestive system as no digestion occurs in it.
It probably wasn't a bee because they are strictly vegetarian. It was probably a wasp.