I'm a little confused. You backpack every weekend so why don't you take what you normally take on your weekend trips? I do a lot of 4-10 day trips in the Sierra and either take my own homemade dehydrated food and/or some freeze dried store bought meals. Any dehydrated/freeze dried meal will easily stay "fresh" for any backpacking trip you do.
If I am using store bought meals I repackage them in ziplock bags as they pack down in the bear canister much better and weigh less. I also use a bobby pin to poke holes in the ziplock bag as they will expand when you get to elevation if they are airtight.
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