Trolley Bags with Key Lock

Can you expand on key lock?

Motocaddy have two locator pins in the base of the bag which is also recessed, it’s fantastic. I’ve got the aqua flex hybrid stand bag and once it’s on the trolley it’s solid! Given there’s a link between motocaddy and powakaddy, I’d assume there is a similar system with them and no doubt the bags are out the same factory