Believe it nor not in the olden days tourists, explorers and servicemen didn't travel with phones and computers! Somehow we managed to get along pretty good! Forty years ago, when I was a young guy in the military, posted overseas, I was lucky to get snail mail in two weeks!
A couple hours being "not connected" is not necessarily a bad thing!
Traveling in the Himalayas recently, we were stuck in a place after landslides closed the road ahead; and flash floods washed away a bridge. No electricity, no cellphone service. We got news of the outside world from arriving travelers following in our footsteps. So there still are places where being connected is more difficult.
As noted, keeping things charged is NOT a necessity of life. Try turning things OFF and looking at the world around you. Nowadays I do travel with an iPad Mini but I don't let it dictate to me, I dictate to it when it will be turned on or left off. If the battery dies or I can't find a place to charge it, it waits till I can. It's never resulted in my dying so far.
Re backpacks, take a look at the Osprey Porter 46 and the Osprey Farpoint40. Two of the most popular packs for a reason.
There is a difference between a true 'backpack' designed for wilderness use and a 'travelpack' designed for the type of mostly urban travel that most people posting here about 'backpacking' do. I'm guessing you are not going to be doing much if any actual wilderness backpacking. The Lowe pack you mention is in fact a wilderness backpack and so probably isn't the best type of pack for you to be looking at.