Yeah. Make a list on a spreadsheet. Having weighed everything, put in a formula to sum the weights column. Save it.

Now eliminate everything you haven't used on a previous trip. If this is your first trip, that's going to be harder. Instead, eliminate everything that isn't on someone else's list. It's not like you're going to the moon.

Now look for the low hanging fruit. What's heavy? What could easily be made lighter? What could expensively be made lighter? Make some decisions. If money is not an issue, spend it!

For the size issue, put everything made of fabric in compression sacks. Don't forget to add the weight of the sacks.