If you want to keep your mod in your pocket (I assume your pants'), then any Wismec Reuleaux will definitely too big. The question is how you vape and at wattage and also do you have any price point. There are many mods (way too many, in fact) out there that suit different person's need. I can suggest some pocket-friendly mods such as the vaporflask, the SX Mini M or ML Class, or if you like DNA boards and chips, the Panzer box or the VT200 might suit your need.
If you want something even smaller and not going into high wattage, you might try the IPV D2 (or3), the Minikin, the Nugget or the Minivolt. Also, one of the smaller mods I use more frequently is the Encom Voidray.
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