Composite compressible drink mix bag

A composite compressible drink mix bag for receiving a drink mix therein, the drink mix being in a first state before adding water while in a second state after adding water, comprising:

• a water permeable, hollow compressible body defining a deformation axis, a cross-section of the compressible body being perpendicular to the deformation axis, the compressible body having folding lines and formed with two openings over each end thereof;
• a first cap;
• and
• a second cap, the first and second caps coupled to two ends of the compressible body and covering the openings respectively, the compressible body and the first and second caps collectively defining a receiving space;
• wherein when the drink mix is in the first state, the two ends of the compressible body are adjusted along the deformation axis according to the volume of the drink mix, when the drink mix is in the second state, the two ends of the compressible body are adjusted along the deformation axis to allow the drink mix for relaxing, and when the compressible body is immersed in the water, the two ends that are coupled to the first and second caps maintain an overall shape of the compressible body.