Source for heavy cardboard sleeves

[Meltrope3]

A typically obsessive-compulsive collector question: I've been trying to find the best source for REALLY heavy cardboard sleeves. Bags Unlimited in the USA makes such sleeves in white, and they are of very high quality with a price to match (they call them "jackets", reserving the term "sleeve" for items made of paper). The problem is that they're so slippery-smooth and glossy you can only write on them with a Sharpie (and even a Sharpie will sometimes smear). The 10 inch sleeves from Bags Unlimited are marginally less glossy than the 12 inch, a kind of eggshell if you will, but still way too shiny for my purpose, which is simply to be able to record various data (and my deathless critical commentary) on the sleeves in PENCIL.

Kurt Nauck's tan-colored disc-o-philes take pencil well but are much thinner than I like. I've cracked enough records in my life, so I try to keep them girded in the stiffest material possible.

It's a lead pipe certainnty that non-glossy white stiff cardboard sleeves/jackets are being made SOMEWHERE, because I've picked up a few records from various auctions that were in them. Getty used this kind of sleeve. Has anybody found a source for the ideal stiff, pencil-annotatable cardboard sleeve?

[FloridaClay]

Kurt's are by far the best I have found so far.

Clay

[Victrolacollector]

I am not sure if you are looking for some really heavy sleeves.

Norman at Berlin Phonograph Works sells some for the Diamond Discs, they are felt lined.

[Meltrope3]

Thank you!