Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the Canon SL3 and Canon T7 side-by-side from the front, back and top in their relative dimensions. Canon SL3 has external dimensions of 122 x 93 x 70 mm (4.8 x 3.66 x 2.76″) and weighs 449 g (0.99 lb / 15.84 oz) (including batteries). Canon T7 has external dimensions of 129 x 101 x 78 mm (5.08 x 3.98 x 3.07″) and weighs 475 g (1.05 lb / 16.76 oz) (including batteries).
Below you can see the front-view size comparison of the Canon SL3 and the Canon T7. Canon SL3 is clearly the smaller of the two cameras. Its body is 7mm narrower, 8mm shorter and 8mm thinner than Canon T7.
Here is the back view size comparison of the Canon SL3 and Canon T7.
Now lets look at the top view comparison of Canon SL3 and Canon T7.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon SL3 is 26g lighter than the Canon T7 but we don't think this will make a significant difference.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you also have to take into account the lenses that you will be using with these bodies. Since both Canon SL3 and Canon T7 have the same Canon EF/EF-S lens mount and APS-C sized sensors, lenses will not be a differentiator on total size of the system.
Unfortunately neither the Canon EOS Rebel SL3 (EOS 250D / EOS Kiss X10) nor Canon EOS Rebel T7 (EOS 2000D) provides any type of weather sealing in their bodies, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top DSLR Cameras with Weather Sealing
LCD Screen Size and Features
Canon SL3 and Canon T7's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Canon SL3 sports a Fully Articulated screen
which you can change the angle and position of the screen almost freely, making it possible to shoot from waist or over-the-head levels, and especially very useful for shooting selfies and video. Canon T7's LCD screen is a fixed type which provides almost no flexibility in shooting positions compared to SL3.