Arney,

I have had my SteriPEN for over a year and according to SteriPEN's web site, hydro-photon.com the demensions have not changed. I think the REI add copy is very out of date. I will know for sure when the one I ordered from Piragis arrives.

For the last year, I thought that my wife was lusting after me when she gazed in my direction but, alas, it was for my SteriPEN.