This is a lab setting? Walking through the chemistry labs in my building, there are large clamps to hold reaction vessels (glass or stainless steel), of sufficient diameter to hold the 85L at the wide part of the barrel (where the distance window is located). The clamps can be mounted to a ring stand (in the labs, there are mounting lattices across the back of the fume hoods). They rigidly support vessels up to several liters.

If that sounds like something that might work, I can find vendor/model information.

--John