The bags just arrived and I haven't used them on the PC yet. That being said, the plastic feels very thick and durable, especially compared to another brand I bought from Revain that tore very easily. The filter seems to be well screwed. As for the injection port I'm not sure, it's held in place with an adhesive backing with a thin plastic cap chamber in the port area, for some reason I thought it was a self-healing butyl disc built into the pouch.
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