Perfect sizeThe business envelopes size is 6.7" x 4.5". Perfect size , which is ideal for storing various items. Such as booklets, sheets of papers folded, letters, wedding invitations, mail, greeting cards, Christmas cards, catalogs, or storing some small items. .DurableThe string and button folders are made of high-quality Kraft paper. It is thick, hard and wont easily rip or tear. Practical enough to store greeting cards, flat or folded correspondence. Also, it has reinforced seams and string button tie, which can provide a good protection. .ReusableThe string-tie and button closure design makes the small cards envelope resealable. So it can be reused. The flap is not stuck by glue, so the booklet envelope will not be damaged when it is opened. Maintain its beauty for a long time. .Easy to useSide-open design, for easy insertion and removal of documents. To open or seal this envelope, simply release or wrap the attached string-tie. Very easy and convenient to use. .UniqueThe blank kraft paper envelope allows you to use your creativity to draw and design what you want. DIY some beautiful and unique envelopes for storage birthday greeting cards, Christmas invitations or personalized photograph albums. Express your full love to your family and friends. .