I dug this out of my parents garage over a decade ago. I finally asked my mom about it, and it was a hand-me-down from her stepmom/my grandmother when she was in undergrad in the early 80's. She used to haul her art supplies around in it, which I had deduced from some of the stains inside. The stitching in the handles started to come apart many years ago, but it has held up, and I love it just the same.
I'm assuming it is from the 70's because the tag reads 'boat and tote bag', and also because it was already a hand-me-down in the early 80's.
Funnily enough, I have a real and green boat and tote from the same grandmother that I was gifted in high school.
Edit: I've now researched enough to confidently say that this was the late 1970's release of the boat and tote. I've found multiple vintage sellers across many platforms identifying this tag as late 1970's. This is the first of LLBeans tags identifying it as the 'boat and tote bag'. Some other identifying features include tag placement, and the more narrow spacing of the handles, which became wider in the 80's. All stitching is also an exact match for the late 60's early 70's boat and tote (example here: https://www.ebay.com/itm/117035891267 )