460mL of water
The XP 40 is a 1998 XP Super Soaker that holds 460mL of water. It is no longer available for purchase since it's home line has been discontinued. It is classified as an Air Blaster and has since been replaced by the XP 240.
The Super Soaker XP 40 provides a decent back-up for any water fight. Its small size makes the XP 40 easy to conceal and carry. Based on the pressurized reservoir system, the XP 40 requires a little more pumping to maintain good pressure when one's water level begins to drop. Also, one cannot refill the blaster when pressurized, leaving one temporarily vulnerable when filling at an unsafe filling station. The pump stroke is also rather short and may feel a little awkward when pumping. Then again, that's the price one pays for such a small weapon. The reservoir comes with a tethered screw-cap to prevent the cap's loss.
The tank easily splits and leaks. Apparently this is a common problem so if anyone finds a solution please post it on this page.