I've spent a lot of time trying to find an inexpensive and quality solution - here it is. I can put them in a picture envelope, mail them in a plastic bag, and they'll arrive safe and sound (assuming the USPS doesn't decide to consider my "fragile" stickers a silly personal challenge).
π¦ Aviditi SF18 Single Corrugated Length Box
3 Review
π Ultimate Protection for Pharmaceuticals and Cosmetics: Insulated and Resistant Pack
8 Review
π¦ Juvale Corrugated Cardboard Sheets: A Versatile Solution for Packaging & Shipping Supplies
3 Review
BOX USA BSP1814 Corrugated Sheets: Premium Packaging & Shipping Protection
3 Review
Honeycomb Cushioning: Eco-Friendly Biodegradable & Recyclable Wrapping Solution
3 Review
Innovative Nifisa Honeycomb Alternative: Remarkable Cushioning for Ultimate Comfort
4 Review
π¦ 6X10 Inch Pouches for Secure Cushioning in Shipping Supplies
3 Review
Heavy-Duty Perforated Sticker Supplies with Advanced Cushioning
3 Review