We do have a “bag technique” here at VNSNY and the policy reads as follows:
“Select a flat, hard surface to place bag and set up work area. Use discretion and consideration when placing bag on patient’s furniture. Never place a non-rolling bag on floor. Keep bag closed when not in use. (Note: According to APIC, there is no scientific basis for barrier placement; studies have not shown that a barrier placed under a nursing bag in the home is effective against preventing the transmission of infections.)”
As you can see, our policy also mentions that nurses must never place their “non-rolling” bag on the floor. Fortunately, the bags VNSNY uses are backpack/wheeled carry on hybrids, so the bag sits upright on its wheels at all times. Our nurses use a sterile barrier but only to place sterile equipment they use during care (e.g. stethoscope, syringes, etc.), not their bag.
Anyway, APIC is a good source of information about infection control. I would also recommend the CDC website, but many of the docs related to infection control are linked to the APIC website (www.apic.org).
I hope this helps, but if not, I hope my response will help generate a debate in the community about this topic.