Hey there, will this fit the infrasecure atlas or Infrasecure Luxi? Thank you!

Hi Kris,  the dimensions of the Britax travel bag is 43.2 x 39.4 x 80 cm, however we don’t deal with the Infasecure seat range so you will need to check direct with them on their car seat sizes to see if it will fit.  Hope this helps.