Hello, I thought I'd share with you another storage idea- this one is for Promarkers. My lovely hubby got me this storage rack for Christmas. It is from Crafters Companion, although I think he got it from the superstore.
It consists of 6 trays each of which holds 12 pens so 96 in total. It has the perfect sized slots for Promarkers, Trimarkers etc but I would say they are too large for Copics etc.
As you can see mine is already overfull! This is a much better way of storing pens than I have used before (boxes, cases, pots etc) but if I get any more colours I'm going to be a little bit stuck!