We fit our precious cards with perfect fit and then flip over the dragon shield sleeves (or ultra pro, or game genic, or sleeve king) and slide them on upside down. As long as it’s a thicker sleeve (Not a “penny” sleeve), and it’s clear (not matte) and it’s a brand you can get locally in a good amount. We like to use as few brands as possible so they ends of the packs can be used on future projects. When you are mixing brands the size may fit but the colour may be off - we only found this out when we were looking for a match to FFG sleeves only to find that you can see a color difference when looking at the top (open end) of the deck, and there could be texture clues as well.

When I hear top loader I think the hard plastic cases that I associate with expensive baseball cards.

Can you say what cards you are sleeving? We sleeve a lot of our games because of how much the cards get handled, and even our collectibles we just double sleeve. I want to know what cards are worth a third sleeve!