500 #00 5x10 PREMIUM US MADE KRAFT BUBBLE MAILERS PADDED ENVELOPE BAGS Premium Quality, Heavy Duty Light Weight Polyethylene 3/16 bubble lined shipping envelopes. Strongest Available Envelopes & High Quality Shipping Envelopes. Pressure Sensitive Seal that is tamper evident and secure. UPS, USPS, FEDEX Approved Available in all sizes