I to shoot 4x10. For temporary storage, I store my 4x10 negs in glassine sleeves I make myself by joining two 4x5 sleeves together. I use a razor blade to slit the bottom open of one of the 4x5 sleeves and and then slide the open ended sleeve INTO (not over) the other sleeve. I then tape them together.
For permanent storage I modify a three-ring binder photo page that has 4-4x5 sleeves. I slit the bottom of the top sleeves open using a very sharp pair of scissors and then slide the 4x10 neg through the top sleeve in to the bottom sleeve. The 4x10 is not covered at he point where comes out of the bottom of the top sleeve and into the top of the bottom sleeve. I have never had the 1/4" exposed part of any 4x10 neg damaged.
Hope this helps.