Here is a review of a convenient pen I purchased a few months ago at Meijer. This is one of my go-to pens that I keep in my pocket along with my change & keys. It shows some scratches from the "abuse" it takes, but it's a good pen to have on-the-go. I wrote this review about a month ago but never got around to posting it. :)
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Below is a size comparison of the F-301 (top) with the following, from top to bottom, Zebra Z-Grip, Zebra Z-Grip Max, Zebra Ola.
The Zebra F-301 Compact is available from Amazon here