I keep individual holders inside individual zip-lock plastic bags at all times... except when they are in the camera or in my changing tent. For transporting I use small 6-pack size coolers and ten or so bagged filmholders fit easily in a cooler.
The bags I have are 6x9.75 inches and 4x5 filmholders are a perfect fit.
With this technique they virtually never get dirty even if they are out in the field with me all day.
Bob G.
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