Securable glass jar  works well.  Southeastern squirrels fit into this just fine.
I like this bottle because it is not overly large and made of glass.  Southeastern squirrels fit into it just fine & birds do not enter it.  I especially like the ability to twist it firmly into place thus it is secure..  I do remove it at night because something during the night has eaten the peanuts & chewed the opening wider on a bird/squirrel feeder to get at the sunflower seeds.  However, last night, I put a bright motion activated light in front of the feeders & the feeders appear to have been not disturbed.
Rating: 5 stars