https://www.ebay.com/sch/i.html?_nkw=3M+Self+Sealing+Packing+List+Invoice+Enclosed+Envelope+1000+Count&_sacat=0&_dmd=2

3M Self-Sealing Packing List/Invoice Enclosed Envelope, 1000-Count

Regular price
$173.00
Sale price
$115.00

Poly, self-sticking, waterproof envelopes ensure your packing list arrives with the package. Bold, eye-catching black lettering reads "Packing List/Invoice Enclosed" with a red background and black border. Permanent adhesive sticks firmly on your packages without moistening. Back-loading envelopes offer a visual window to display your information.