50 Sheets Skytone Paper
Skytone is my absolute favorite paper for tessellations. It's crisp, reverses creases easily, and is hard to put a hole in, unlike Tant. It only comes in light shades, which are great for backlighting, and it has a variety of nice colors.
My students agree that this is the best paper for tessellations too, but it's not usually available in more than one color at a time from the manufacturer and they don't ship internationally.
So, I'm making my own stash available to you to help you use the best paper available. This pack contains 50 sheets of 19x12.5 inch Skytone of various colors (natural, white, blue, natural cream, as stock allows).
This size is what I use for the vast majority of my own tessellations and you can get one large shape (either square or hexagon) and two smaller shapes out of each sheet (hexagon templates really help with this). I've found that I can reliably cut through 5 sheets at a time using the templates, and you can also take these sheets to a local print shop to get them all cut square at once.
If you'd like to get hexagon templates and folding tools along with your paper, check out the full pack option.