Because of the need to preserve freshness of food and simplicity to use it, the idea of making a bag clip came up. After market review the potential for bag clip which with its unique design ensures practicality of use, less number of parts, recyclability and favorable ratio of invested and obtained in relation to the current market offer has identified. The thesis is separated into theoretical and practical part. The theoretical part follows three main topics: designing, optimization and polymers. In the introductory part are presented examples of different clips and share of plastic waste generation as a growing problem that needs to be taken into consideration already in the design process. In the second part of thesis the designing process is described in details with emphasis on the designing of polymer products. A brief description and examples are presented for easier defining the list of requirements and making the morphological matrix. Rules for technological design of polymer products as well as recommendations of DFA operations for polymer products are extremely important for designing and functionality of the design, because of that they are explained in details in this part of thesis. The review of theoretical basis of LCA analysis enable making of qualitative LCA analysis for the design of multipurpose bag clip. In order to simplify the process of optimizing the design of bag clip, methodology for optimizing the design is developed. In the third chapter are also presented the most important theoretical parts for solving optimization problems using FEM. Theoretical bases for designing, optimization and polymers were used to make the initial and optimized design. A list of requirements was made based on the potential needs of customers. Using the morphological matrix four conceptual variants of the product were obtained from which the optimal variant was selected by evaluation. The initial design of the multipurpose bag clip was designed in accordance with the rules of technological design and DFA recommendations. The critical location of the design and the maximum load is determined. According to that the calculation part of design are made, for which a numerical calculation of the initial design was made using ANSYS. That calculation will serve as the basis for optimizing the design. Optimization of the calculation part of design was made in ANSYS by direct optimization using the “Screening” method. Limitations of input parameters are defined according to rules of the technological design, and limitations of optimization are defined according to the material specification. After the optimization process, three solutions are obtained from which the constructor selects the optimal one. According to the optimized parameter values, the optimized design of the multipurpose bag clip was designed and mass of that design was compared with the mass of initial design to determine the mass reduction. Using ECODESIGN application a qualitative LCA analysis was made with the aim of getting recommendations for improvement strategies and the presentation of a multipurpose bag clip from production to disposal and recycling rather than the generating plastic waste.