Hallmark Gift Card Holder (Miniature Mailbox With Birthday Balloons) Open the door on this fun mailbox to reveal your gift to a special recipient inside. This gift card holder measures 3.75 inches wide by 3.75 inches high by 5.75 inches deep and can accommodate standard size gift cards. Includes one gift card holder that is ideal for any gift card-giving event. Hallmark gift card holders are made with paper from well-managed forests. Hallmark was founded in 1910 when 18-year-old J.C. Hall arrived in Kansas City, Missouri, with a couple of shoeboxes of postcards under his arm and the American dream in his heart. Hallmark greeting cards are sold online and in nearly 40,000 retail stores across the globe and people continue to recognize the iconic Hallmark brand as "the very best."