Went hunting locally for a 1-litre vacuum flask today. Had to go two suburbs west to find one, then decided not to buy it as it was of lesser quality than pricier items.
Settled for a 1.2-litre one instead (which could have been purchased locally).
A couple of days ago the sun was out and I took the mobility scooter for a trundle, taking a thermos of coffee and my Kindle. I found a nice shady spot and the one regret was I ran out of coffee because the flask was too small.