ArchAngelCD
Member.
Because you mentioned a backpack and not wanting a belt holster I think you might like The Chesty Puller Conversion System made by Simply Rugged. (you have to add a holster to the system) If you already have a favorite belt holster for your G20 this system will be just what you need to convert that holster to a chest unit. If you need a holster the have The Cuda for semi-autos. They make a full line of great products for a fair price and more importantly, they all work and work well. (no, I'm not affiliated with them at all)