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After one year and 70 hours of flying, I'm finding there are some things that are handy to keep in inventory in my spares box. Some are because I needed to swap out and bought an extra, some are just because I thought it would be good to have.

A spare tire and tube
Oil pressure sender
Fuel cap
An opps fitting

What's in your spares box?

What do you take with you on cross countries?

Great question! For most of my local flying I don't really carry much in the airplane, but if I'm going on a long distance (for me, over 100 nm) trip and I know the airplane will be parked outside and tied down (such as Oshkosh or Crossville), I'll generally carry the following:

1. Tie down kit (The Claw)
2. Sonex canopy cover
3. Extra quart of oil
4. My travel tool kit, which includes:
- assortment of tools, including sockets, wrenches, screw drivers, pliers, etc.
- assortment of spare parts, including lots of AN bolts, nuts, washers, cotter pins, tie wraps, etc.
- spare tube (don't carry a tire...maybe I should!)
- flashlight
- different tape, including electrical and duct tape
- canopy lock
5. Cleaning supplies, such as microfiber towels and cleaners

At some point this spring or sumer, either before Oshkosh or when I'm up there, I also plan getting a spare fuel cap for my tank and adding it to my kit. Unfortunately my tie down kit and tool kit are both pretty heavy (I'd guess 10-15 lbs each) but I'd rather have all that stuff and not need it.

Its really two different lists.
One is my box in the hangar of spare parts I probably will need over the life of the plane and want to keep them in stock.

The other is what you mention, what to bring with on trips.

Some additional items for the at-home spares "what expendables do I need to maintain this plane" box:
- Oil change parts kit (2 gaskets, 6 small sump screw washers, oil plug washer)
- Oil
- Spark Plugs
- Rivets (assorted)
- Cotter pins (assorted)
- Lock-nuts (assorted)
- Batteries (to fit my ANR headset, GPS, headlamp, etc)
- Chemicals:
-- Gasket sealant (Permatex #3)
-- RTV
-- Locktite red
-- Locktite blue
-- Antiseize compound

For the "take on the cross-country" kit, I think Mike's list covers it. I'm still looking for an inexpensive, light way to tie down a plane in the grass--seems there must be a better way than a variation of a zillion solid, heavy round steel stakes (which is what I've been using).