⭐ SECURE. - ⭐ WINDOWLESS DESIGN. - ⭐ #6-3/4 SECURITY ENVELOPES. - ⭐ MULTI-PURPOSE. These envelopes can easily fit invoices, letters, checks, gift cards, etc. These envelopes can be used for virtually anything you need them for!
Darken the interior of the envelope to improve security
The opaque shading on the inside of the envelope should be a lot darker to afford better security. As it is, one can look at the envelope between a source of light and essentially see through it well enough to determine the contents inside the envelope. The shading/painting of the inside needs to be a lot darker.