Need macro or help

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Is there a way to have a macro that will open the backpack that's in my Backpack when all slots are full?

No


but try this
It will use stack of cristal coins if u have exacly 100, 200, 300.... etc.
So it wont keep changing CC into Plats.
[macro]300 {100cc} Cc:=3043 ic:=Misc.ItemCountEx(!Cc!) VarMod(ic, 100) !ic!==0 Hotkey.Use(!Cc!) exit() [/macro]