Most of the mods usually give a direct to lungs experience to the vapers. However, this is not the way one generally smokes. During smoking one generally, inhale from the mouth to lung. It is also known as mouth to lung or MTL vaping. Small ultra-portable vape devices used to replicate this MTL style vaping. Therefore, these are capable of giving better satisfaction to the vapers like smoking a cigarette.
Small and Stylish looks
Most of the mods look heavy and big. It is difficult to carry the mods in the pocket. Therefore, mobility becomes a huge issue when it comes to big devices. Further, carrying it to a place, where vaping is not welcomed is another problem with these devices.
However, most of the small portable devices are very sleek and easy to carry devices. In a few cases, it is difficult to recognize them as a vaping device unless one points out. An example is STIG that looks more like a Pendrive rather than a vaping device. Therefore, such small devices making it easier for the vapers.