  Localized magnetic topological solitons with Hopf index of 1 in an unbounded
bulk magnet are studied theoretically, starting with the classical
micromagnetic Hamiltonian. It is shown analytically that (like Bloch and N\'eel
walls in classical magnetism) there are two possible stable configurations of
these solitons, which are equivalent topologically. Their stability regions are
plotted on a phase diagram in the magnetic field -- uniaxial anisotropy space
for different normalized magnetostatic interaction strengths. For some
parameters both types of hopfions can be stable.
