Any diaper brand that is as big as mamypoko night xxxl?

Im really having a hard time trying to find a bigger cutting diaper for my boy. His weight is about 20kg+. Wearing 3xl mamypoko junior night pants for both day and night n find it abit unworthy due to quantity to wear during the day. He poop quite often too so such a waste. His quite chubby with BIG butt and thigh. Hope to find 4xl but none. Any recommendations? Btw his not ready for training pants ya as only 1yr plus going 2yr. #pleasehelp