Apparently in the 1800s gray wool was much less expensive then other colors.
West Point (USMA) uniforms were gray because it was the least expensive option. The USMA uniform factory is who explained that expense drove the original selection of gray. It was an interesting tour, they’ve been making uniforms there almost since 1812.
Army blue would have been the natural pick, but blue is one of the more expensive dyes. Dyes were not near as sophisticated then, and I believe the only medium to dark blue was indigo.
I would assume the butternut Confederate uniforms were similar, has the Confederacy had very little money and many units had to outfit themselves or were funded by their colonel. Butternut is not gray, it’s more of a dark natural brownish yellow.
I don’t know where the idea of Confederate gray came from because all the uniforms I’ve seen or read about have been butternut. There might have been gray forage caps.
Back on topic, I’ve had gray backpacks and bags long before any tactical gray surfaced. I selected it as it was a neutral color that didn’t look out of place in business environments, etc. And specifically it was not olive, khaki, or similar.
What people now think of as tactical gray actually has a lot of blue in it and does poorly in camouflage, even in urban environments. So to me it’s not tactical at all, it’s just a neutral color. I despise the super brightly colored backpacks just as much as I do black.
There is an aspect of contextual camouflage in play, and the opposite: My roll-on bag is a pelican bag with wheels and handle in khaki that I found on sale. Coming and going on a lot of military bases, it nearly always requires inspection while larger bags don’t even get a glance. Same thing with an ammo can that I carry my traveling tools in.
If I do use that pelican carry-on bag I pack my underwear clean or not on the very top then if they want to rummage through it they can.
It’s a bit silly and a significant security blind spot… Bag should be checked on what they could possibly contain rather than their exterior.
Someone said it here first but I believe it to be true, the best low profile bag or color is a well used scuffed up baby diaper bag as no one will look in it.