I agree with you Glock-A-Roo, I have tried one pack of the reflective twist ties and they work well, they also pack flat and do not poke you in your pocket or rattle like tacks (I now keep my tacks in a film container with paper tissue).

It is true that if you get off the trail and are looking for a tack sideways they do not show up well, the twist ties prevent this problem but do not work well on large trees; perhaps a mixture of the 2 types would work best.

Mike