So I've posted threads about both of these bikes in the Mechanics' forum, but people who I see in C&V don't always come around to the mech forum so I'm posting about these bikes here, as well.
I recently finished building up both a 1980 Schwinn Traveler and a commuter build using a nearly identical frame, from a 1978 Schwinn Le Tour III.

Both frames 68.5cm (27") frames with 63cm top tube, made of straight-gauge high-tensile steel (1020) tubing, with lugged construction. Stamped horizontal dropouts with no derailer hanger, requiring a "claw" to attach rear derailer to the drive-side rear dropout. Both frames are also a similar hue of blue, sort of like Carolina Blue but a bit darker and more saturated. They're designed for 27-inch rims, and won't take anything smaller with the Dia-Compe centerpull brakes that came stock with both bikes. And both frames weigh just under 10 pounds for frame+fork+headset.

Also, both bikes have ridiculously high standover height, such that I can stand over with zero clearance while barefoot, or with about one inch clearance when wearing shoes. This makes the bikes a less likely target for stealing, as no one who's shorter than 6'4" can even stand over the top tube.

I've outfitted the Le Tour for commuting utility, with 1x7 gearing, and a rear wheel with 7-speed cassette that I built specifically for this bike. A 13-34 cassette is paired with a 40t (steel) chainring (set at 41.5mm chainline) - the crank came on the Schwinn Traveler when I bought it, and has a chainguard built into the spider so I don't need to worry about pant-legs and drive-side shoelaces, or about the chain falling off. I used a 7-speed rapidfire shifter and a rear derailer with integrated "claw" hanger, taken off an old mountain bike with horizontal dropouts and now derailer hanger. The flat bar is topped off with bar-ends (which I use when riding along at a constant speed without need to shift or brake), a little horn (rated for ages 3-5!), a speedometer, and a blinking light.

The Traveler is built up as a nice-ish road bike, with 45cm Nitto drop bars, new Tektro brake levers, used SunTour bar-end shifters, pre-indexing Shimano 600 rear derailer, a 105 crank with 52/42/ biopace rings, a 6-speed freewheel and super-durable 27" touring wheels. It rides great and looks much prettier than the Le Tour, and not just because the paint job is in better shape.

There's more detailed information in threads in the Mechanics' forum, about the builds and parts list:
Schwinn 1978 Le Tour III commuting build
Schwinn 1980 Traveler road build

Here are links to galleries with lots of photos of the bikes, along with a few pictures to spark your interest:
Schwinn 1978 Le Tour III commuting build, which has links to pictures of the sweet rear wheel and pictures of the bike in its earlier commuting incarnation with drop bars and 1x5 gearing.
Schwinn 1980 Traveler road build