In this paper continuity properties of the set-valued map p → B p (μ 0 ), p ∈ (1, +∞), are considered where B p (μ 0 ) is the closed ball of the space L p ([t 0 , θ]; R m ) centered at the origin with radius μ 0 . It is proved that the set-valued map p → B p (μ 0 ), p ∈ (1, +∞), is continuous. Applying obtained results, the attainable set of the nonlinear control system with integral constraint on the control is studied. The admissible control functions are chosen from B p (μ 0 ). It is shown that the attainable set of the system is continuous with respect to p.