In January 2001, when the band called Dumb Luck (which later became The Used, then consisting of Quinn, Jeph and Branden) were looking for a singer, Quinn remembered Bert and he was invited to try out. After being given music that the band had written without words, Bert wrote the lyrics to what would become “Maybe Memories” and returned the next day with a newly recorded version of the song. The band welcomed him immediately, and renamed themselves “Used”. They were eventually discovered by John Feldmann and signed to Reprise Records; they became “The Used” when it was discovered that a Boston band had already trademarked the name “Used”. On June 25, 2002 they released their self-titled debut album.

In 2004, McCracken’s then-pregnant ex-girlfriend Kate died of a drug overdose, as the recording of The Used’s second album In Love and Death was coming to a close.

In July 2008, McCracken married his Australian fiancée, Allison, at a private ceremony in Los Angeles. In July 2013, he announced that he and his wife had relocated from Los Angeles to Sydney, Australia, where their first daughter, Cleo Rose McCracken, was born in January 2014. Their second child, Minerva “Minnie” Bloom McCracken, was born on March 23, 2018.

Bert McCracken has voiced his support for Palestine alongside being critical of aspects of contemporary American culture and society, such as the influence of larger corporations on the music industry; which partly prompted his move to Australia in 2013. His political views were also influential in the lyrical content of The Used’s 2014 album Imaginary Enemy.