Co nhieu kich thuoc phong bi thu khac nhau tuy theo nhu cau va muc dich su dung. Mot so kich thuoc pho bien bao gom: A2, A6, A7, DL va #10. Kich thuoc A2 la 4.25 x 5.5 inch, thuong duoc su dung cho loi chuc sinh nhat hoac loi chuc mung. Kich thuoc A6 la 4.5 x 6.25 inch, thuong duoc su dung cho thiep ca nhan hoac loi chuc ngan. Kich thuoc A7 la 5 x 7 inch, phu hop cho cac loi chuc dai hoac loi chuc mung ca nhan. Kich thuoc DL la 99 x 210 mm hoac 3.9 x 8.27 inch, thuong duoc su dung cho thiep mau hoac thong bao. Cuoi cung, kich thuoc #10 la 4.1 x 9.5 inch, thuong duoc su dung cho thu bao gia hoac thu quang cao. Chon kich thuoc phu hop nhat cho muc dich cua ban se giup cho phong bi thu tro nen dep va chuyen nghiep hon.
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