Need suggestions for overnight diapers

My 8 month old is an amazing sleeper. I know that could change any moment so I’ll brag while I can. We sleep trained at 6 months and he regularly sleeps 7pm to 7am. BUT he pees through his diaper, onesie, sleep sack and crib sheet almost every night ever since he started sleeping on his tummy. I feel so horrible in the morning when he gets up soaked, even though he doesn’t seem to mind. He’s currently in Kirkland size 4 and they finally fit perfectly, but I was wondering if anyone had any suggestions for more absorbent overnight diapers based on similar experience?