I've had my same Reunion Blues triple trumpet bag for 30 years. Holds 2 large trumpets (Bb,C or Flugel) and one small (picc,D,Eb)
I use the smaller compartment for mutes and other stuff that don't fit in the side compartments most of the time.
I've been all over the world with it. It is my carry on for plane flights. Never had a ding to my horns that I could blame on the bag.
Reunion Blues Trumpet Gig Bags