The Cronkhite DBM is a lightweight leather or Cordura soft case with wood reinforcements and firm foam for two trombones of most any type. Made in Minneapolis, MN, USA, to order in 12 weeks. I try to keep several in stock.
This is a very light case, less than 7 pounds. Size is 12x12x40". If the leather is in your budget, it makes the case much stiffer, though it adds weight. The Cordura nylon case is a bit more flexible if you're overfilling the case with your horns, which is what we do.
I/Steve like the rounded edges and soft fabric of the Cronkhite when carrying. It's more comfortable on my back than a rigid case with its square edges. I've owned my smaller DBS case for 20 years and it's still firm and protective and beautiful and incredibly useful. I've had no damage to my instruments except one small bell ding. It was my fault as I too vigorously pushed the end of the case to fit it into a full car.
Both ends of the DBM case have wooden disks for bell protection. The hand slides fit diagonally across the middle and have a wood stiffening board in the slide sleeve. Two Velcro straps secure the hand slides.
Maximum bell size is 9" & 10", so you can put two of most any trombones in there. Alto and tenor, two tenors, tenor and bass, maybe two basses, whatever you need to do.