Originally posted by Tant01
Isn't that the reason for needing the knife? I'm not sure where you're planning on inserting your straw, coke can, pen, ect.
In reality, most pens are to constrictive at the end to allow enough air to flow through. If a normal straw is tough enough to pass liquid through, and you can breath through it without collapsing it, it shouldn't be a real problem.
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