birthday card for mom

They lie flat when folded and then pop up into a three-dimensional sculpture when opened; descriptions note they are fully collapsible so they close flat again.

Dimensions vary and include common folded sizes such as 7" x 5", 5.5" x 4.25" (A2), 7.06" x 8", and around 4.625" x 6.75" for some flat cards.

Many cards include envelopes; some come with heavyweight embossed envelopes and peel-and-stick flaps for easy sealing.

You can find single cards, two-card sets, and three-card packs.

Some pop-up cards are listed at about 2 ounces and may require extra postage. Check the specific product listing for the exact weight and confirm postage requirements with your postal carrier before mailing.