Sony T90 weighs 148 g (0.33 lb / 5.22 oz) and has external dimensions of 94 x 57 x 15 mm (3.7 x 2.24 x 0.59″). Considering that the average weight of Compact type cameras is 188g, Sony T90 is a remarkably light camera for its class. Even better, with a thickness of only 15mm, it is also quite small, 13mm thinner than the average of its class.
Now lets compare the weight and thickness of Sony T90 with its main competitors:
Sony T90 doesn't have any environmental sealings on its body so you got to be extra careful to protect it against water and dust. If you shoot under these conditions very often, consider checking Top Compact Cameras with Weather Sealing page.