Jessie still hasn't unpacked his bags from his trip.
First, if I replace "unpacked" with "opened," will I make a change in meaning?
Second, what does 'his bags from his trip" refer to? For me, "his bags for his trip" makes more sense to me.
Thanks.
Unpack is correctly used. It means that he removed the contents of his bags. You can open your bags and see if your cothes are there and leave them inside; but, if you unpack your bags, it means that you remove the contents from the bags.
The preposition from is appropriately used in your sentence. He came back from his trip. He`s not preparing for a trip.
Thanks, teia, for the clearcut reply.