(250+50 Free)Total 300 Pcs#00 5x10 E-lite Kraft Bubble Envelope Mailers US MADE/ 300 Per Case 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,Made in USA