As Eris starts explaining, I'm surprised to find out there's really not that much difference between a dimensional storage box and a storage ring.
"The main difference is capacity," she says, casually pulling items out of her box like it's nothing. "Boxes can hold more. A lot more, actually."
She flicks her finger and a pile of clothes tumbles onto the floor with a soft flump.
"And they're easier to make," she adds. "The flat surfaces make it way simpler to carve enchantments. But with rings? The surfaces are tiny, curved… it's honestly a nightmare to write on them."
"Ahh… I see," I say, nodding as I watch her with wide eyes.
"But," she goes on, "rings are more portable, since you can just wear them on your fingers. They're a lot more fashionable and discreet, too. Nobles love them. Some wear them like jewelry, just to show off."
"Oh, makes sense!" I murmur. "But wait... wouldn't that make them way more expensive?"