We have like 10 bounty slots now, you don't really need to store them.
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let me put it into something more easy then say your working on the 10 kills without dying bounty and you get 9 kills without dying the last match of iron banner and it goes away now you have an almost done bounty taking up space from actual bountys you can finish when your waiting for the next iron banner to arive for that 1 kill when you can put that bounty in storage tell then and you will still be able to have 10 now more cause you got storrege to stock up and have a full on bounty day cause for me i dont always like doing bountys everyday so that would give me more room to work with and be more organized