Abstract: A container having separate storage chambers is disclosed having a main body containing a first substance, a lid member tightly engaged with the main body, an airtight member for encapsulation of at least a second substance, a holder assembly for retaining the airtight member therein, and an opener with a cutting portion for releasing the second substance from the airtight member. The lid member is in tight contact with the holder assembly so as to prevent spillage or leakage of the first substance. The airtight member can be cut open by the cutting portion of the opener, thereby releasing the encapsulation of the second substance and allowing mixture of the first and second substance in the main body, the opened-up airtight member remaining held by the holder.