I found a 27.8" X 16 " on Amazon
https://www.amazon.com/AltraTech-Drying-Silicone-Dishwasher-Kitchen/dp/B083DQZF8K/ref=sr_1_5?crid=27OPVWW9MURSM&keywords=large+bar+mat&qid=1679949455&sprefix=large+bar+mat%2Caps%2C139&sr=8-5 but have not purchased myself.
mine is an 18" X 12". If I saw this one before I purchased mine, I might have bought it, but I am happy with mine. I don't feel too constrained.