I’m sure other bottles are available, but I found this on Amazon and have been very impressed with it. It didn’t break the bank and keeps lunch nice and cool when I’m out for the day - and removes any excuse my subconscious might come up with to have something less healthy instead. (10Kg down, 10Kg to go…)
It’s a bit pricier than the one mentioned above. Keeps everything chilled and stops people in the office asking too many questions or making comments that I’m ‘on Slim Fast’ or that I ‘can’t keep it up in the long run’ despite me using Huel for over a year…