If one wants to organize her browsing around a specific set of "persistent" containers ( like the standard Personal, Work, Banking & Shopping ) she can use, for example, 'Firefox Multi-Account Containers' or 'Sea Containers'.

'Containers on the go' takes another approach by creating new non-descript "temporary" containers, beyond the range of the "persistent" ones, named 'CG 1', 'CG 2' etc.

A nice thing is that both 'Firefox Multi-Account Containers' and 'Sea Containers' can "see" and use the
'Containers on the go' containers. 'Firefox Multi-Account Containers' can even edit/delete them.