Reddit reviews Ultra Pro Pack of 100 One Touch Resealable Poly Bags Sleeves for Card Holder

Ah, I see. I understand it now. Do think these are good as card bags?

Not sure if this would be big enough but 2 of these bags with 26 cards in each might work out. Be sure to add toploaders to prevent the cards from being bent in the postal system though.

If it doesn't fit then use something like a 6x11.5 inch envelope instead, those should fit comfortably.

Ultra Pro makes something called One-Touch magnetic card holders that are supposed to be uv-resistant, so those might be a better choice than a regular top loader. My secret rare charizards are in those on my shelf, and they are double-sleeved in clear plastic self-sealing oversleeves made specifically for the one-touch holders. My room is also pretty dark usually, so that's extra protection...So I'd recommend trying the uv-resistant One-Touches but avoid putting any particularly rare or valuable cards in them if it's still in direct sunlight. The uv protection may not last over time.

Regular sleeves don't fit inside these, though. I found that perfect fit sleeves only barely fit and it is a snug fit, hence the double-sleeving on the outside of my one-touches.

Edit: This is the thing I'm talking about. http://www.pokeorder.com/ulproonetoma2.html

These are the "oversleeves", called polybags, I guess: https://www.amazon.com/Ultra-Pro-Resealable-Sleeves-Holder/dp/B00BUVFB16?ie=UTF8&*Version*=1&*entries*=0 (They also fit on top loaders!)

If you are worried about this, they have resealable bags that you can put over them. Here's an Amazon link below. When you do this, it makes it pretty tight. I've probably used a couple hundred of these and the only issue I've had, i just found tonight with my 2015 Kris Bryant RC. The card literally came right through the side on the one-touch. The magnet was still intact. The only thing I could figure out is that it looked like one of the tabs on the opposite end of the magnet had a flaw in it. Otherwise, they have been great!

https://www.amazon.com/Ultra-Pro-Resealable-Sleeves-Holder/dp/B00BUVFB16/ref=asc_df_B00BUVFB16/?tag=hyprod-20&linkCode=df0&hvadid=167151447010&hvpos=1o1&hvnetw=g&hvrand=439373201924293094&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9027718&hvtargid=pla-311441019024&psc=1