  Gas is now discovered commonly in exoplanetary systems with planetesimal
belts. In this paper, we verify whether gas is also expected in the Kuiper belt
(KB) in our Solar System. We predict that gas is still produced in the KB right
now at a rate of $2 \times 10^{-8}$ M$_\oplus$/Myr for CO. Once released, the
gas is quickly pushed out by the Solar wind. Therefore, we predict a gas wind
in our Solar System starting at the KB location and extending far beyond with a
current total CO mass of $\sim 2 \times 10^{-12}$ M$_\oplus$ (i.e. 20 times the
CO quantity that was lost by the Hale-Bopp comet during its sole 1997 passage)
and CO density in the belt of $3 \times 10^{-7}$ cm$^{-3}$. We also predict the
existence of a slightly more massive atomic gas wind made of carbon and oxygen
(neutral and ionized) with a mass of $\sim 10^{-11}$ M$_\oplus$. We predict
that this gas could be observed with future in-situ missions and may play an
important role for, e.g., planetary atmosphere formation in the Solar System
history.
