i pack it with the tools strange i choose normal packfile(vpp format)till..why 37MB? Did you add hd textures or something? What did you edited in it to make it grow that big?
EDIT: i noticed, that once extracted, your shaders's files are the same size then vanilla's shaders's files.. so i think the reason for the size it have now is because of the way you pack it,..did you pack it as a normal package or stream?
EDIT2: i packed all your files as normal package and the size is back to normal..i suggest you repack it that way