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2. Padded envelope - Wikipedia

   en.wikipedia.org/wiki/Padded_envelope

   Mailing envelopes and small packages may receive as many as 27 handlings during shipment with the maximum drop height of 1.2 metres (3.9 ft). [1] The contents of the mailing envelopes often need protection from shock and vibration damage. Cushioning or padding can be built into the mailing envelope to help protect the contents.

3. Self-addressed stamped envelope - Wikipedia

   en.wikipedia.org/.../Self-addressed_stamped_envelope

   A self-addressed stamped envelope (SASE), [1] [2] stamped self-addressed envelope (SSAE), [3] or stamped addressed envelope (SAE) [4] is an envelope with the sender's name and address on it, plus affixed paid postage, that is mailed to a company or private individual.

4. Envelope - Wikipedia

   en.wikipedia.org/wiki/Envelope

   An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...

5. Flats (USPS) - Wikipedia

   en.wikipedia.org/wiki/Flats_(USPS)

   The United States Postal Service uses the words "flats" and "nonletters" interchangeably to refer to large envelopes, newsletters, and magazines. Size restrictions [ edit ]

6. Bulla (seal) - Wikipedia

   en.wikipedia.org/wiki/Bulla_(seal)

   A bulla (or clay envelope) and its contents on display at the Louvre. Uruk period (4000–3100 BC).. A bulla (Medieval Latin for "a round seal", from Classical Latin bulla, "bubble, blob"; plural bullae) is an inscribed clay, soft metal (lead or tin), bitumen, or wax token used in commercial and legal documentation as a form of authentication and for tamper-proofing whatever is attached to it ...

7. Hermetic seal - Wikipedia

   en.wikipedia.org/wiki/Hermetic_seal

   A hermetic seal is any type of sealing that makes a given object airtight (preventing the passage of air, oxygen, or other gases). The term originally applied to airtight glass containers but, as technology advanced, it applied to a larger category of materials, including metals, rubber, and plastics. Hermetic seals are essential to the correct ...