bags with a beam
Most Beam central vac units can be fitted with a bag, I did this with mine since I don't like emptying bagless units, other than water filtration vacs. It will be interesting to see what Electrolux comes out with, they have now sold off Beam, Sanitaire and Eureka. The Beam units are a bit expensive for what you get though, you can get power units that perform just as well at cheaper prices.
Mike