When Bebeco first began we used to advise against all in one nappies because of their poor performance, but when bumgenius came along we instantly saw a brilliant design that was as leakproof as the best two part systems available.. At last a nappy that was onesize, needed no outer cover; it also proved to be fast drying yet absorbent.  Pretty much everything you would want in a real nappy.  It's also so easy to use that people everywhere have been won over by the Bumgenius.