The phrase "a sealed packet" is correct and usable in written English.
It can be used to describe a packet that is securely closed or not opened, often in contexts related to packaging, food, or information.
Example: "Please ensure that you only use a sealed packet of the ingredients to maintain freshness."
Alternatives: "an unopened package" or "a closed envelope".
He hands me a sealed packet no bigger than a hotel bar of soap.
If the applicant's visa petition is approved, the consular officer will give his or her passport (now containing a K-3 visa) back, along with a sealed packet containing the documents s/he provided, plus additional document from the consulate or embassy.
Fold foil over beets, and crimp edges closed to make a sealed packet.
Gal asks Jay if the soap in the bathroom is in a sealed packet and is relieved to find that it is: "I hate dirty soap".
Later, Griet is visited by the cook from the house, who comes bearing a gift: a sealed packet containing the blue headscarf she wore in the painting, wrapped around Catharina's pearl earrings.
Manufacturers recommend that a gum elastic bougie may be disinfected up to five times between patients and stored in a sealed packet.
A total of 128 male and 141 female subjects were randomized to receive either a lasercomb (one of three models) or a sham device in concealed sealed packets, and were treated on the whole scalp three times a week for 26 weeks.
Take the notion that humans might one day be so good that lies are despised (imagined in Edward Bellamy's 1888 science-fiction novel Looking Backward) or taxes willingly overpaid, as in Louis-Sebastien Mercier's Memoirs of the Year 2500: "I saw several people, with easy, cheerful, contented looks, throw sealed packets into the chest, as in our day they threw letters into the post office".
Most festivals will allow sealed packets, but every festival is different, so check before you go.
Lucy, 19, told the researchers: "The first time I bought Xanax it was through Snapchat because I could watch the dealer opening sealed packets on his story before he sold them, and I therefore felt safe consuming them… I would never buy anything I hadn't tried before from some guy on a street corner or anything at all really, unless I was desperate".
Transfer flour or other product and store in air-tight containers as much as possible, or try to make sure that you properly seal packets.
