Info från tilverkaren:

SPS®-system
Up to 10,5'' bell Ø
Padded plywood support in the bell area
5-sided plywood box in slide compartment
Attached accessory pocket, shoulder strap
Permanently attached, adjustable deluxe rucksack straps with new quick stow system (GEWA System)
Strap pocket also usable as music sheet pocket
Slide pocket dimension approx. 84 cm