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Trolling bags, drift bags, trolling socks, drift socks, all the same thing. Much smaller than a sea anchor. The way to prevent the drift/trolling sock/bag from tangling lines is to have one on either side of the boat when trolling, about 2/3 of the way back from the bow with the small open end of the bag secured to the boat to prevent the bag from going too far out to the side or under the boat when turning. When drifting you would usually only have one bag out, in the direction from which you are drifting. Shouldn't be too hard to avoid tangles with one bag out. A fish could have a different idea though.