I used to do a lot of backpacking. I usually ended up taking a lot of stuff. I'm a hedonist who likes to sleep comfy, so I had a 3/4 Thermarest that I stuck on top of a full length closed cell foam (like a Ridge Rest or other cheap foam) pad. I carried the foam pad on the outside of the pack so I could use it as a seat whenever I sat to rest.

Do you have a compression stuff sack for the sleeping bag? Those things are great for really getting the sleeping bag into a small ball. They don't weigh much more than a regular stuff sack.

You'll be much happier with some hot food. I second the other's suggestions on a lightweight stove and a small aluminum pot.