How many pouches are in one velo?

Excuse me, could you please clarify something for me? In the context of the phrase "How many pouches are in one velo?", I'm a bit confused about the units being referred to. Could you explain what exactly a "velo" is, and how it relates to the pouches being mentioned? Is this a specific terminology used in a particular industry or context? I'm interested in understanding the question more clearly so I can provide an accurate answer. Thank you.