For my heavy wetters I use 2 MF inserts topped with two bamboo or hemp boosters!
Another thing I just tried last night was to stuff them with my retired TB Fluffles that OH won't use because they are nippas and a hemp booster! They had the biggest bums going to bed last night
but not a leak this morning even though they wore them for 14 hours
The pocket is so big that you could probably fit a small towel in there!!!