Difficult sentence: A competitor may submit any number of entries provided...

[duc]

Can you tell me the meaning of the sentence below:
A competitor may submit any number of entries provided each one is accompanied by a packet top.

what does 'submit' here means?

What does 'a packet top' means?
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Don't see your shade think you are great

[Mister Micawber]

.
'Submit' here means 'send in'.
'A packet top' is the top portion or flap of a package of the product.
.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber