ulthor said:
the best thing would be campaign against it rather than asking them to recode
But this idea is only if they are going to implement it. It is a suggestion as to HOW they could limit the backpack and still allow some flexibility. Surely it is better to get this idea in now then spend time campaigning against it only for them to implement it anyway in a way that is not as good as this proposal. This is trying to get them to see this idea and maybe take some inspiration from. Not likely, I know, but it's worth a shot.
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Yes, I agree that you should be able to switch your warehouse stuff into a different warehouse, but at a 'removal' cost, maybe?
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Diggo, not it's not fair, but neither is the fact that non-town members don't have access to a bank. This at least gives you access to it. As suggested by madkill, maybe it should give everyone a 'level 1' warehouse, but non-town members have to rent a higher level from the game. I think the non-town members should have to choose a town to 'host' their warehouse though, even if level 1 is free, so that it is not accessable from every town (otherwise what's the point?).
I also like madkills suggestion of automatic moving when full. I'll amend my original post with all of this info.