Organizing Letters?

Hello penpals!

I send and receive a LOT of letters. And besides a small handful, all my penpals are snail mail penpals. I love keeping and collecting the letters and envelopes people send me whether to reference in future letters, or just to look back on and admire the decorations, etc.

Only problem is that I’m stumped on how to organize it. I can’t stand things be super untidy—and just having all these letters in a pile in my craft drawer is bothering me to no end lol

I was just wondering if anyone out there has an organizational system they swear by or anything like that? Or just any tips in general to keep things a bit more tidy? I’m limited on space, especially drawer space, so I could use some pointers if you have any 🫶

Thanks in advance!