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Browse 6+inch+opaque+envelope on sale, by desired features, or by customer ratings.


Alibaba.com offers 1,135 opaque envelopes products. About 72% of these are mailing bags, 6% are paper envelopes, and 1% are paper crafts. A wide variety of opaque envelopes options are available to you, such as kraft, kraft bubble, and ordinary paper.


An opaque envelope is an envelope that is transparent or translucent. It is dull in color and does not allow light to pass through.


Opaque envelopes are the go-to envelope for enterprises that need to balance performance, cost and visual appeal. They are available in smooth and vellum, bright white and cream, and always perform reliably on press and in the mailroom.


Accent Opaque envelopes are ideal for volume mailings where superior brightness and opacity are a must. Made from 97-bright Accent Opaque paper with enhanced whiteness, these envelopes are converted by Mohawk to stringent specifications—ensuring trouble-free inserting on a wide range of equipment. Both the smooth and vellum finishes provide minimal show-through and excellent offset and ...


Cougar White Envelopes, 4-BAR (3-5/8-x-5-1/8), 104 GSM (28/70lb Text). Found at PaperPapers, Explore our popular White Envelopes - with 10% post-consumer recycled content and many earth-friendly certifications, it is an ideal environmental choice. Product: Envelopes Color: White


Browse 1000+pack+opaque+envelopes on sale, by desired features, or by customer ratings.


A premium line of paper from Domtar that enhances your brand's personality and purpose. Be it digital or traditional printing methods, the Cougar® line will transform your ideas into impactful statements.


Perhaps the most common is the sealed envelope system. In this participating clinicians are given randomly generated treatment allocations within sealed opaque envelopes. Once a patient has consented to enter a trial an envelope is opened and the patient is then offered the allocated treatment regimen.


Use of opaque envelopes is similarly vulnerable to subversion. Several authors (see, for example, Doig and Simpson) have described in great detail the practicalities of creating what is known as SNOSE schemes (Sequentially Numbered Opaque Sealed Envelopes). This involves numerous complexities such as putting silver foil in the envelope, so that ...