50 Pieces Kraft Bubble Mailers Self Seal Envelopes 8.5″ x 12″ inches. Internal size: 8.25” x 11” Padded bubble envelope for extra shipping protection and reinforced durability; 8.5 x 12 inches, 50-Pack Durable recycled kraft paper exterior with ample room for sticker or hand-written labeling 50gsm bubble interior lining for reliable protection Self-sealing closure with strong, mess-free adhesive Low-cost, effective alternative to box shipping or standard envelopes Ideal for small items or correspondence that requires extra protection during transit