Shucks, any container that does not leak will do the job!
I once used a gallon paint thinner tin (square type) and soldered on a hose fitting to connect things up.
This was for a Jeep snow plow that was operated with a hand pump.
5 strokes and up, crack the valve and down. Worked great!
Naturally a tin can is not long lived as rust will attack unless you have a lot of oil leaks, LOL.
Virtually any container that is oil compatible will do the trick.