50 (30+20) #6 12.5x19 Premium Poly Bubble Mailers Self Sealing Padded Envelopes Mailers-Shipping Bags Ultra lightweight, saves on postage. Push-proof and moisture-proof. Strong polythene laminated to 3/16" air bubble. Shipping labels adhere securely to the cover. Seamless bottom for maximum strength. Smooth side seams.