Closure device

A container comprising:

• first and second sidewalls joined at seams to form a compartment with an opening;
• first and second interlocking fastening strips respectively connected to the first and second sidewalls at the opening, the fastening strips being arranged to be interlocked between first and second ends, wherein the first fastening strip includes a first closure element, the second fastening strip includes a second closure element;
• a slider slidably disposed on the fastening strips for movement between the first and second ends, the slider facilitating occlusion of the fastening strips when moved towards the first end, the slider includes a separator, the separator facilitating the deocclusion of the fastening strips when moved towards the second end;
• and
• the fastening strips include a first seal located below said first and second closure elements near the first end, the separator cooperates with the first seal to provide a seal along the fastening strips at the first end, wherein the separator engages the first seal when the slider is moved to the first end and wherein the slider provides an audible indication as the separator disengages the first seal.