A containment basket made of plastic material adapted for bottles or similar containers for liquids is described, having a substantially parallelepiped structure with sidewalls and a base including grids or slots and with an open side opposite to the base, and comprises a first fastening system on opposite first sidewalls of the basket, for securing one or more fixed grids made of plastic material parallel to the base of the basket, the fixed grids comprising apertures of a size suitable for housing the bottles; lateral guides on opposite second sidewalls of the basket, adapted for housing a lever system for positioning a sliding grid made of plastic material parallel to the one or more fixed grids and in an height-adjustable position along the second sidewalls, the sliding grid comprising apertures suitable for housing the bottles; first windows on the second sidewalls, adapted to cooperate with the lever system in order to allow the height-adjustable positioning of the sliding grid, and also to allow the sliding grid to slide between a first bottle retaining position and a second bottle releasing position.