When something is really big and holds a lot it is capacious, like a woman's capacious purse that is so big, people mistake it for a piece of luggage.

Have you ever seen a Fourth of July hot dog eating contest? As you watch people wolf down 60 or more hot dogs in a matter of minutes, you must be thinking, "Where do they put all that food?" Well, it helps to have a capacious stomach. The suffix -ous adds "full of" to capacity; capacious is literally "full of capacity." If something is capacious, it has plenty of extra room.

Definitions of capacious

adj large in capacity

“she carried a capacious bag”
big, large
above average in size or number or quantity or magnitude or extent

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