It's a white Acerbis tank which I bought second-hand with only 100 miles of use. It was ultra clean inside with no petrol staining.
The tank has the Acerbis lockable filler cap and it is one complete chamber. There are 2 taps so when the fuel gets low you can drain both sides out. The quantities appear to be as follows...
Tank = 24.3 litres
Reserve on LH Side = 1.4lts
Reserve on RH Side = 1.3lts
Total Reserve = 2.7lts
Fuel remaining in tank when Reserve is emptied out = 1.2 lts (0.6lts in each side. The front of the tank is lower than the tap positions.
This makes the tank a 23 litre tank NOT 24lts.
I'm happy with this as there are two XT600s and 2 DR650s going on the trip so in a really bad case scenario where we all run out of fuel, the XTs will have 2.4lts of fuel to tip into one of the DRs.