I use gepe glassless mounts. I started with the 3mm ones, but switched to 2mm as my collection is growing and they take too much space while in storage. The 3mm ones do no fit tightly in any kind of slide pages i tried. The pouch engulfs the mounts in a somewhat open state and dust eventually gets in. 2mm mounts fit more tightly and thus dust is less of a problem.
For data, i just stick a small white label on the white side of the mount.
For storage i currently use small boxes that usually hold 20-30 slides depending on their size. I found that in this way slides stay completely dust free. However i think i will have to switch to slide pages because after a certain amount of slides, box storage and viewing will become increasingly uncomfortable.
A while ago i managed to get a peculiar type of slide pages that has been out of production for quite some time. Each "flipper" holds 5 slides, and each pouch is open from the top and bottom so they can be fully cleaned easily by inserting a brush or q-tip. Each page holds 4 "flippers" and the page opening closes well to keep dust off. I think it is great. Even if dust gets in the page, the "flipper" keeps it off the slides
The brand was Hama. OCD to the fullest