A 4 × 4 envelope is designed to neatly hold small square stationery including:
100 × 100mm inserts
Mini greeting cards
Gift enclosure cards
Thank you notes
RSVP cards
Small birthday cards
Keepsake messages
Handmade card designs
Mini photo prints
Business thank you cards
Craft stationery
Small event inserts
Choosing a 4 × 4 envelope gives compact square cards enough room to slide inside comfortably without feeling loose or oversized. Its petite, balanced shape helps gift notes, handmade cards and keepsake stationery look tidy, protected and beautifully presented for gifting, celebrations, craft projects and thoughtful personal messages.