Unless you really need (3) jerseys for 8-10 days (I never did) - consider 2 short sleeve jerseys and a pair of arm warmers. The weight should be less than (2) Short-sleeve and (1) Long Sleeve (and 'just slightly' heavier than (1) short sleeve and (1) long sleeve jersey).

If you look for areas where things can serve multiple purposes (as above) or in your cooking/eating items I think that you get get rid of a good deal of weight.

Steve A.