Let f be a split
submersion between paracompact Banach manifolds. We obtain here various
conditions for f to be a fiber bundle. First, we give general conditions in
terms of path-liftings. As a consequence, we deduce several criteria: For
example, f is a fiber bundle provided it satisfies either some topological
requirements (such as being a proper or a closed map) or, in the case of
Finsler manifolds, some metric requirements (such as Hadamard integral
condition).