Magnetic Biker Tag Bags are easy to use.
Download the pdf files for instructions here:
RTA Tag installations: http://www.motorcyclee-tag.com.au/pdf/rta-installation.pdf
Installations for other tags: http://www.motorcyclee-tag.com.au/pdf/others-installation.pdf
Installations for small e-way tags http://www.motorcyclee-tag.com.au/pdf/small_e-way.pdf