Holders for safe, long-term storage (specifically for colonials)
I'm starting to dip my toes in the paper world, mostly colonials but a few more modern examples, as well. I'm well versed in long-term coin storage (and rarely buy raw coins), but I want to make sure I'm keeping my ungraded notes safe long-term. Any recommendations for what holders/sleeves I should use? I'm not too worried about the sleeves being too pliable since my notes are stored in a stiff container and can't be bent accidentally. To that end, while I don't handle the notes frequently, I've seen some holders that are very difficult to open up, and I'm a bit afraid of damaging a note if it gets caught on the way in/out of the holder.
Bonus points if you can point me to something Wizard sells since I'm already planning an order there in the near future (https://www.wizardcoinsupply.com/products/currency-sleeves/).