I don't have the Fosters can, but I do have a Heine can that I use with Esbit. The way I typically pack it is by putting everything inside the can and then using a simple cuben fiber stuff sack around it. This pretty much fills the can and will not allow the can to be pushed/dented in unless it is a strong amount of force. I also use a tuperware bowl as my cup which happens to fit over the top of the Heine set-up perfectly. This does provide a bit of protection to the top of the can where it is the weakest. (The bottom of the can is stronger simply because it is still intact.)
When packing it up in my pack, depending on which food bag and backpack I use, sometimes I will pack it inside the food bag standing up so that when I put the food bag in my pack the Heine can will actually be next to the side of my backpack. Nothing will be putting any side pressure against the set-up. The only way to damage it here is if I were to slam my pack into something (which I do not. I do not sit on my pack or throw it on the ground, at least not with this particular set-up...) Otherwise, in m smaller pack, I will pack everything up in the pack and then set the Heine set-up on the very top before I cinch the top closed. Here again, nothing is putting pressure on the system unless I abuse my pack...
(I do understand that accidents happen, but I try my best to be careful with my gear when on the trail. I know that I need it, as well, I don't want to have to replace it because of my carelessness... Besides, when it comes to a true accident, everything is up in the air...)
If it helps any, here is a write up I did on my Heine system with pics and a video which shows how everything nest's inside the can and how it fits really compact...I think it is a great system...but then again, I am partial to it... :)
Also, here is a pic too: