Mummies.. i am curious to know how the breast milk collection shells work.. I have one at home but have yet to try it bcos im concern abt the collected bm itself. So if it leaks, and the shells collect it, when shd i take it out and store? Isit okay to leave it for a few hours then store so tt i can store more at 1 time? Or must i straightaway store the bm once it leaks?