I was trying to remember earlier what the name of that product was, Sue. Thanks for reminding me. I think I saw it offered by Brigade Quartermasters back in the 90s but I haven't seen anything to date that looks similar. Although not as compact as the original evac-u8 (which IIRC was about the size of a can of soda), a surplas gas mask with extra filters might be a viable alternative if possible chemical disasters are a serious consideration. Depending on the chemical types there may be other viable solutions as well.