Large APS-C (22.3 x 14.9 mm) sensor
Large sensor in Canon T6i ensures a good low light image quality compared to smaller sensor, and it also provide shallow depth of field and a nice blurry background when needed.
Even the smallest lens attached to this body will be a burden to carry everywhere with you. 555g
Carrying this weight all day may not be very comfortable for you. Body Thickness 78mm
With a thickness of 78mm,Canon T6i is not a pocketable camera for sure.