The ornamental design for a closure for containers, as shown and described.
1. Closure for containers
1.1 is a front elevation view of a closure for containers, according to the present invention, with the closure shown separated from the container;
1.2 is a second front elevation view thereof, with the cap shown on the container;
1.3 is a third front elevation view thereof, with the capsule of the cap shown separated from the rest of the closure; and
1.4 is a top plan view thereof.
The dashed lines shown in the Figures are for environmental purposes and form no part of the claimed design. The dot-dash lines shown in the Figures represent the boundary of the claimed design.