Why do bags of cement have holes

lots of small holes, what are they there for?

MONEY , what a concept
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Never noticed holes, except for needle holes where they are sewn closed. Could yours be conveyor belt induced holes, to get traction when they are filled and loaded?
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So peeping toms like you can spy on the cement without opening the bag.
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wrote:

It would suffocate without those holes and you'd have dead cement !!!!
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Its so the worms can breath. Thats where they breed the worms for the worm drive saws. See worm drive saw post.

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The holes are there because of how the bags are filled. The bags are actually closed except for a small opening near the top that accepts the feeder (basically a 2-3" tube). An operator will simply slip the bag over this tube and the bag is filled with concrete. The weight of the concrete will then push against the opening to close it. If there were not holes in the bag, then the bag would explode while being filled from the increase in pressure. The same technique is used to fill large bags of dog food, cat litter, etc.
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