The microchannel networks in polydimethylsiloxane (PDMS) are filled with photo-curable polymers. When the microchannel networks are shaped and exposed by UV light, the photoresist inside the channels is solidified and acts as endoskeleton within the PDMS layer, acquiring the pre-arranged shape. Bending and stretching moduli of the materials with solidified endoskeleton increases drastically and once the external stress is removed, the memorized shapes are recovered. The materials and the process of preparation of these microfluidic materials are simple, inexpensive and scalable. The permanent preservation of the shape of solidified microfluidic sheets could be used in making instant packages and supports on demand for protecting delicate contents and multiple other applications.