Abstract: A collection device for human bodily fluids includes an expandable, liquid permeable and insoluble pouch containing a proper volume of hydrophilic material. This hydrophilic material allows quick absorption of such fluids and turns into gelled material. The gelled material is then trapped inside the pouch preventing possible spill and back flow. The hydrophilic material with a proper volume only allows expansion up to the predetermined size of the pouch without the pouch breaking up into fragments. This pouch may be made of different shapes and materials in order to fit in different types of human bodily fluid collection devices and reduce possible leakage and back flow. The hydrophilic material can be a polymer and may have antibacterial properties to reduce bacteria growth. A one-way valve, snap-fit seal, or screw-on cap may be added for further enhanced prevention of leakage and back flow. The versatility of this pouch helps speeding up manufacturing processes and reducing overall production costs.