Designed in Australia apparently, but doesn’t say it’s made there. Though similar looking, they’re not the same at all. The Smash bottle from Sainsburys is different in quite a few ways, 50cl less volume, flatter base, a bit shorter in height. It’s certainly not a direct copy.
More here:
https://www.smashenterprises.com.au/our-story/
If it’s Chinese manufactured I wouldn’t be surprised at all, many of our favourite outdoor products are designed in their country of origin and then farmed out for the exceptional quality and cheap prices we demand. Usually from China. Many of our Spydercos, Benchmade knives, most of our torches, lanterns, stoves, sleeping bags, tents, boots, clothing etc are produced in China.