I keep a collection of small books in various jacket pockets & find them very useful for when I'm bored or in need of spiritual input. This particular version of the Tao Te Ching IS one of those small (11cm x 7cm) books that fits in your pocket & yet can be brought out as a quick read/ refresher.
And, having read a few translations, I've found this to be one of the clearest & most eloquent. The meaning is always understandable & the pithy richness of Taoist thought comes across so powerfully, that it only takes 1 or 2 verses for feelings of joy, enlightenment & inner peace to start coursing over you.
The one downside is that there is no commentary or index. If you are just starting out on your Taoist journey, then I'd recommend Wayne Dyer's
Change Your Thoughts, Change Your Life: Living the Wisdom of the Tao first, and then have this as a top-up for Lunch breaks & times when you have a minute or two to spare.
Needless to say, my version is filled with underlining & notes, as I always find the clear expression of concepts so wise, profound & insightful that I dare not trust my Swiss-Cheese memory with losing them!
Anyway, if you're looking for an excellent pocket version of the Tao Te Ching, then this comes thoroughly recommended. If you're looking for a different interpretation & space isn't an issue, then I've found this version:
Tao Te Ching equally powerful.
And whatever happens, I wish you luck on your journey towards spiritual enlightenment.