They've been experimenting a long time. They must be busy and only have a few minutes here and there. The company President/designer sent me a 3-way mouthpiece with my unit almost 2 years ago. I've never bought a stronger pump to go with it. I just don't need 3 bags at once often enough to bother with it. I'd rather use different sized bags to get a quicker fill. Let us know how that 2L pump works out (if you can find one). I shopped for pumps and it's frustrating trying to find out exactly how much air they push.