This paper analyzes the bending effects of Flexible Chip-less Bow-Tie RFID tag, which is designed and fabricated on three different polymer substrates, Polyethylene terephthalate (PET), Polytetrafluoroethylene PTFE (TEFLON) and Polyvinyl Chloride (PVC). The tag uses the Frequency Selective Surface (FSS) approach and operates within the frequency range of 4 and 18 GHz. The tag is designed using CST studio and then fabricated through a laser etching technique on low-cost polymers. The results are obtained in an anechoic chamber by performing a series of comparative experiments for Radar Cross Section (RCS) of Chipless Bow-Tie RFID tag. The bending capabilities of the tag are noted for radii curvature of 27mm and 14mm. The experimental result shows that the new Bow-Tie RFID tag is more robust and accurate with the distance variation of up to 12cm at 0dBm power and hence, it can be used to encode a bit sequence.