I recently got back into Wacky Pack collecting, having been an original Wacky Pack collector when I was a young boy in the early 1970s.
Thanks to Paul_Maul and others, I have quickly learned some of the basics of collecting and preserving sports and non sports cards.
One of the first things I learned is the basic combination of a penny sleeve and top loader (nod to Paul_Maul). This combo seems to be the de facto standard, unless you go to the expense of getting your card/sticker professionally graded and slabbed by PSA or equivalent.
Penny Sleeve/Top Loader offers a great deal of protection, but I recently discovered that you can take it one step further by placing them in a Team Bag.
https://www.youtube.com/watch?v=EwI31Sf2VzIThe Team Bag not only protects the card/sticker itself, but protects the (somewhat expensive) top loader from getting scratched and prevents the card/sticker from falling out.
I'm in, and all my non-slabbed original series Wackys will be preserved in a penny sleeve/top loader/team bag.