Some time ago I bought some cheapish breast pump cups, to be honest they are not great quality and the vac takeoff port is small, which slows the initial pump.
But they we're better than the ones I didn't have, and I'm starting to see a small amount of change, then yesterday I'd changed the elastic strap for a tywrap to keep the cups closer together so as not to suck up so much under arm, I was warming up and CRACK. a crack had appeared up the side of the dome just beside the tab where the strap goes, bugger I thought, I bet that's from only using one tywrap it's pulled on one side I'll go back to the elastic strap, a quick bodge repair and it's sealed and using the other tab to put the elastic strap back on, I settle back down for a good long pump, I had just turned off the electric pump and gone to static -5inch when I flexed my chest muscles and CRACK, it happens again.

Choices I could buy another cheap set for £15-20, break them and step up and buy a nooglberry for £70, or I could save myself £15-20 and go straight for the Nooglberry, as luck would have it, they even have 10% off so I've got a pair of XL airlock domes with silicone rings, for £60.