1981: Osborne 1
The first commercially successful “portable” computer, tipped the scales at 23.5 pounds.
1994: IBM Simon Personal Communicator
The original smartphone, combined a PDA and cellphone in a slimmed-down 8x2.5x1.5-inch form.
2010: Apple iPad
Apple iPad, the first truly successful tablet, weighed in at 1.5 pounds and leapfrogged decades of development by other manufacturers.
2014: The Samsung Galaxy S5
Not unlike a portable briefcase, offers 16GB of storage (up to 128GB through removable storage) at a heft of 5.1 ounces.