I also have the LowePro Orion Mini. I originally bought it to carry my 300D but found it a bit small for that. I think I will end up using it for one of my RFer's, probably the Commando (MF folding RFer). This bag is great. It is very light, well padded and very comfortable to wear due to the wide waist straps. The quality and workmanship is top notch. PLus it is not too badly priced.
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Collector and avid user of classic and vintage cameras: Yashica Electro 35 GSN, Zorki-4, Neoka 35 IVS, Mamiya 35S2, Voigtlander Vito CLR, Ricoh 500GX, Minolta A5, Ensign Commando MF Rangefinder. PLus an assortment of MF, Zone Focus and SLR cameras.