Donate them to a young digger or collector who is just getting started. If you don't know any local to you, some who visit this site might be happy enough to have them that they would pay for postage, though I realize that is not an inconsequential expense these days.
If nothing else, donate to a thrift store or go with the "FREE" sign out street-side as CanadianBottles suggests.
You really aren't a preservationist are you. It's silly, pathetic, and outrageous to even conjure the idea of ACTULLY throwing these away to be taken to dump full of modern trash, possibly break, and additionally, to possibly never been seen again. A McCORMICK'S EXTRACT CIRCA 1920 !!??? WHAT? That's a $4 bottle! You're crazy, and quite frankly, I don't think you should possess historical objects. Nor, should you be on this forum where we respect and collect bottles. NOT THROW THEM AWAY.
I'd hang onto them. Will you have a garage sale sometime? if so you'd get something out of them. Probably average a dollar or so apiece.
Back in the 1970s we left lots of bottles behind when we dug. ACL sodas had no value then, and milk bottles were not very old and a dime a dozen. Not everyone on here keeps everything they find out in the world. We brought home most anything earlier than the automatic bottle machine but we brought home very little after abm.
I'd probably do it a bit differently now, as acl sodas have a following, and milk bottles, depending on the dairy, are worth something, sometimes serious value. But I haven't been a digger in decades. It still is amazing to me to see bottles from my youth (I'm 56) trading for value now. Heck, back then they were worth 5 cents redemption...