Charts are a pain in the tits.
personally I chop the sod up. Anything which isn't required is hacked off. Then if your only flying in one area its in the center then sensible folds. Always fold both ways along a crease so you can fold it back on yourself.
Have seen many brillant attempts using bulldog clips paper clips etc. All it made me do as an instructor is garantee that i will pick a diversion which is going to be most awkard.
Must admit to wards the end of my VFR flying I got very lazy. One was always on board but i don't think I looked at it for the last 9 months.
MJ