Portable cases (100 and 200) are invented to carry various mobile electronic devices (MB ED) e.g. smart phones, tablet computers, notebooks, media tablets, E-readers, portable digital assistants, and mobile phones. The basic idea of this invention is not only to protect above mentioned electronic devices, but also provide a convenient to carry and use these products. The case (100 or 200) is designed to carry, fix, attach, remove, and detach any MB ED with ease. While this also facilitate users to operate any MB ED as it is fixed in case (100 or 200). Furthermore, case (100 or 200) ha s properties to attach it with many other daily usage products named as ' Base system ' like hand bags, school bags, briefcase, purse etc, as attaching case (100 or 200) to these products provides real mobility to users.