Pampers nappies

I have a baby boy who is 18 months old and have always used pampers nappies since birth but I must say im so disappointed with this new pampers air channels coz we now change him 4 to 5 times in a day as thy become Full or saggy very fast and every Morning he wakes up extremely wet even his Pjs. Previously he use to stay with a nappy up to 8 hours n sleep well thru out the night, a mega box didn't even last a month????