ssh-add /path/to/key1
ssh-add /path/to/key2

eval $(ssh-agent)

Host myteam1.bitbucket.org
    Hostname bitbucket.org
    HostKeyAlias bitbucket.org
    IdentityFile ~/.ssh/keyA


Host myteam2.bitbucket.org
    Hostname bitbucket.org
    HostKeyAlias bitbucket.org
    IdentityFile ~/.ssh/keyB