Ok. I know that Mylar sleeves are the best quality note holder on the market. It is said that over a long period of time the other holders, or at least some of the other holders, will decompose/discolour and potentially exposing your note to a variety of problems. I am not challenging the material used rather am interested whether or not the 'wave' at the bottom of the holder would warp the note over time. On the bottom border of the holder there usually is a slight wave - some worse than others - leading me to believe that this might result in a wave in my notes - especially the UNC ones. Don't get me wrong, I love the waves, in a crowded stadium or in the water, but no particularly on my notes!
Has anyone found that this 'wave' causes any harm to their notes? I realize that this wave might not affect the notes but a holder that is made to protect my flat note yet the sleeve itself is not perfectly flat when laid horizontally leaves me to wonder. I also thought about placing the Mylar sleeve inside a dominion size sleeve but that is not very cost affective.
To answer my own question I placed a GemUnc $20 journey note, of no value, into the holder and will keep it there for 2 weeks - then I will draw a personal conclusion from there. But for now I would like some input.