It’s been suggested many times and is a great suggestion in theory. In practicality it is much more difficult, but nevertheless it is on our roadmap and we’re working on improving the packaging of Huel on a number of products.
Please, to answer your questions about refilling the pouch, read this post:
https://discuss.huel.com/t/zero-waste-returning-packaging-for-reuse/7874/2?u=timofficialhuel
I will lock this thread due to multiple similar threads.