In this case less is more.

I have found that I tend to bring fewer and fewer items with me to the flying field. In no particular order, this is what I consider essentials:

One fuel container with a fuel pump that doesn't rely on electricity. The Dave Brown Sixshooter is inexpensive and almost bomproof.

One glow plug connector with a rechargeable 1.2 V NimH or NiCd battery. I prefer a Du-Bro RC Kwik-Klip II with leads to the battery as I find it more versatile than the ones where the battery and connector is integrated into one unit.

A chicken stick (a dowel with a with a piece of garden hose slipped over it) to help preserving fingers when starting the engine.

A piece of rope and an old screwdriver that can be driven into the ground in order to restrain the aircraft when starting.

A small first aid kit for cuts and bruises.

A 35-mm film container with some spare links and an assortment of screws and bolts to fit your aircraft.

A couple of extra glow plugs (stay away from the cheap ones, OS 8 and Enya 3 or 4 are safe bets). You only need one or two extra ones unless you run fuel with a lot of nitro.

A couple of extra propellers (if you buy a brand such as APC they are sufficiently well balanced that a prop balancer is not necesary at this stage).

Some screwdrivers and pliers suitable for the fittings on your aircraft. A glow plug / propeller nut wrench.

Some means of checking the Rx battery status, either externally in the form of a digital voltmeter (or expanded scale voltmeter) that puts a load on the battery or simpler, a battery checker that is mounted inside the aircraft. I find that the latter is usually sufficient.

/Red B.