Wondering what you stuff your WNSS mediums with. Easy Peasy seem to be just a tiny bit too wide and the other boosters I have are just not big enough (random hemp and bamboo although they are only slim ones). I had a hemp booster under a large MF cloth today and when Immy wee'd it came through the back at the sides
I find the BB combo inserts are fab. I haven't had a medium WN but have used the BB inserts onthe medium setting in a onesize and it worked great, they have the advantage then of being able to use them in large pockets when you get there too
Joeybunz Hemparoos (S or M) work well, or just about anything you can trifold. They are quite narrow! Haven't actually tried a BBOS insert, it seemed like they might be a little wide , though I do love them in our WNOSs.