The bag, made out of tubular coated fabric, was susceptible to contamination. The  remainders along the edge in the case of tubular fabric coating, even after they were trimmed off properly, could be dropped off inside and be contamination during the process.

To enable us to avoid this kind of contamination problem, we put adhesive tape along the edge and laminate it partly over the adhesive tape to ensure residues do not remain on the edge, which as said above, could become foreign matters after being dropped off inside the bag.