In paper envelopes...
Nah lol.
Most of my PC is in toploaders, and hard cases (screw downs/magnetic holders).
I'm aiming to store the entire collection (Just Devins and Mavs stuff) in Magnetic holders, they are SOOOOO clear when they brand new.
(here's a plug for ya Colin).
See Colin @ NW Card Supplies (member here) for all ur needs.....