Spinnor

There used to be sold a style bicycle handlebar bag that used what I think is a formed spring steel rod that fit over the handlebars and looped under the handlebar stem that supported a handlebar bag. For whatever reason this style does not appear to be available any more. I think it is a superior design, very light. I would like to reproduce roughly the shape of the bent metal seen below. The metal rod frame appears to be spring steel, you can squeeze the ends together a fair amount and it returns to its original shape when you let go. I have bent the rod below with and without heat to fit various bikes I have owned, it is very strong but not brittle. Can you recommend a type of steel rod that is not too expensive, available and would work in supporting a bicycle handlebar bag. It needs to be very strong yet give a little. I have a flame weed eater that produces a lot of heat that I think I could fangle a kiln to heat the steel if heat treatment is recommended. Thank you for any help.