Waterpumping with regular cylinder vs. Bathmate

I currently have a 2x9 cylinder that I can put a small amount of water in and use mouth suction with pretty good results. I pack pretty quickly, and in 20 min I can get pretty huge.

Is there any benefit of getting a bathmate? What is the internal diameter? Can it get a proper amount of suction?

Thanks,
Philadelph

I think what you are doing is as good if not better than Bathmate and I doesn’t cost any additional money. You can also walk around the house without any worries.