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Leather gloves, in addition to whatever insulating gloves you bring. Good for dealing with campfire stuff, moving hot campstoves, clearing rocks and brush for your tent.
In general for longer trips, I try to take a philosophy that everything should have multiple uses. I sleep in a hammock, which makes a nice chair to sit around in, and takes less space than a tent and sleeping pad. (hammocks seem a polarizing issue though, so I guess it depends on the climate, your comfort, etc).
Food is often the most bulky and heavy item. I like to do lots of stew type things that simmer for a while on the campfire. If you're trying to quickly cover ground, the freeze dried stuff has a major factor of speed, weight, and convenience. Throw in some normal but calorie dense stuff, though: hard cheese, salami, peanut butter, crackers, etc.
I like my SteriPen, I don't have any desire to go back to squatting over a creek, hand pumping something while dealing with a tangle of hoses. I bring a backup, though (iodine) since it's a little unnerving trusting an electronic device with a critical part made from glass. It's never failed me, and I've never been sick from it. If you're going super light, just do the iodine.
If it's just you, or a very small group (1-2), Esbit stoves with fuel tablets have some advantages: you always know exactly how much fuel is left, they pack very small, and there is little waste (e.g. fuel bottles) to deal with. Make sure you test this with your cooking setup, though, to know how many tablets it takes to boil your kettle.
