Size 4 Poly Bubble Lined Bags™ are sized to fit A4 items, measuring 225 x 330mm internally and 250 x 350mm externally. Our poly padded envelopes are made with a tear, burst, and water resistant, virtually indestructible, polyethylene outer, making them a robust and secure, yet very lightweight mailer, for a wide range of products. We use a high slip coating on the bubble wrap interior so despatch is quick, easy, and snag-free. Our fully recyclable Size 4 Poly Bubble Lined Bags™ are a low-cost alternative for Size 7 Arofol Poly envelopes and have 100 bags per box.