Take another look at the sentence:

Everyone always invites Marc to the movies, his jeans are so oversized that he can sneak in two two-liter bottles of soda, which he straps to his thighs, saving his friends from the outrageous drink prices at the theater.

Which he straps to his thighs is a relative clause that is interrupting the flow of a complete sentence. This complete sentence starts at his jeans are so oversized .... An interrupter needs to have a comma both in front and behind it.

Go back to the sentence to try again.

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