Mail Lite bubble envelopes 6. These bubble envelopes feature Aircap 3-layer bubble wrap, ensuring the air stays in the bubbles longer, have a self-adhesive sealing strip, and can save up to 35% on postage costs. These bubble envelopes are ideal for sending CDs, medical and dental products, etc. Paper weight: 79 gsm. Dimensions (L x W): 440 x 300 mm. Colour: white. Box: 50 pieces.