Oil container for keeping in car

[to3m]

My car uses 1 L oil per 2,000 miles. (There's no obvious leak. Where does it go? How does it get there? A mystery.) But apart from that, I like my car, and topping it up is cheaper than buying a new one.

Any specific recommendations for a good container to use for keeping 1 L of oil in the boot? The plastic containers that oil comes in don't always have very tight screw cap threads, and I've had some oil make a partly successful escape attempt. There are plenty of suitable-looking receptacles for sale here and there, but not much information about how tightly they'll keep hold of their contents if they come loose and start rolling about in the boot.

[to3m]

Thanks for the replies. I was thinking there might be some brand of container that was well known to have a tight seal on its lid, but if the usual solution is simply to put a container in a bag then I can manage that.

Haltamer said:

I'd have thought the original container would be fine

1 L or 2 L containers seem OK, but then I bought a 5 L one and put it in the boot. It was all going fine until I opened it up and poured 1 L into the engine, leaving something like 3.5 kg of oil to slosh around in a no-longer-100%-watertight container...

ARHarh said:

Just keep the bottle at home and fill up when you get home. Not often you do 2000 miles in one trip surely.

I'd normally just top it up at appropriate intervals, but my car has no dipstick, just a stupid readout that can tell you (a) when it needs 1 L, and (b) nothing else useful. I don't much fancy guessing, and I've had to fill up mid-trip often enough that keeping some oil in the car seems sensible.