My son leaked out of everything including doubled night disposables. Both very bulky & need one piece pjs to avoid compression leaks but good night sleep is awesome!
Here is what works for us:
Option one: sandy's with a flips organics laid inside & an airflow cover.
Option two: lollidoo pocket fleece fitteds stuffed with a flips organics & thirsties doubler & a felted disana cover.
Cheapest option: sandy's & disanas! Love!!!