I wrote this riddle for M awhile ago. What do you think the answer is?

I am contemplating an assortment of containers. I really couldn’t tell you how big they are, but they are all of relatively the same size. Their contents vary tremendously depending on what they are called on to hold. They have no edges, but they do have endings. You can’t see where they start, but no one would argue that they do. And I’m actually using them as a measure right now, despite the fact that I could never lay a ruler against them. What are they?

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