Game rules are two-word input. I considered DIY containers in 'Seeker of Magic', but it wasn't possible with two-word input. You really need to be able to say PUT WING IN BACKPACK. You can't imply the container in situations where you have multiple containers in the same room. For example, if you've got an open backpack and an open fridge in the kitchen and you say PUT WING, where do you put it?
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Like I said, you could just make more objects carriable when the backpack is present or just leave it out. It’s about the logic, not the technique behind it. Also, the game encouraged me to look inside the backpack and then I got a reply that it’s not a container, assuming these are system messages, that’s on Chris todo not on yours