I've made a few of these and keep getting requests but I am never happy with the way the bottom sits. It's made just like a tube you see up with lots of increases to start and it always goes back to looking like a bag rather than sitting nicely. I'd like to reinforce it somehow but I am not sure how. Beans will just collect. Cardboard will bend. I thought about knitting the increases section with yarn held double but I am not sure.
I'd be really grateful for any ideas.