Hold stamps, coins, jewelry, keys and other small parts.. Built sturdy from 24 lb Kraft; thick paper provides privacy and durability for the items you tuck away. A heavily gummed envelope flap holds moisture activated adhesive; creates a firm seal you can trust to keep contents safe. Store loose keys, sort collectible coins, give a gift card or watch your garden grow; from seed envelopes to storage mini envelopes have thousands of uses. Stock up for home, office and school; these little yellow envelopes come in handy everywhere.