I really think that two changes would greatly improve the stash tabs:
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a height of 18 squares, everybody should know why - for every item placed, beside one square items and belts it would fit - exactly
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sorting could be improved - example: all rows are filled but the last two- so in this example we are having a free place 17 by 2. If I fill it with rings and amulets - it will start to fill the first 17 in height than starting to fill up the last row off 17 from bottom to top.
This will also happen in any other row - and by this way its blocking places in all other places too. So I think it would be better if rings and amulets - are not stacked in height. At first priority it would be better if those items would be organized in width 2 and after that in height