We have a grand total of 200 spaces in our vault inventory.
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We have 117 (lol) spaces in each individual characters inventory.
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There is a total of over 350 weapons so far.
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There is a total of over 760 armor pieces so far.
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If we were to add all the space we have at out use its 551 spaces shared across 3 characters. The total items in Destiny 2 that can be transferred to the empty space is OVER 1100 (double lol).
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We can barely fit half of all our obtained stuff in free spaces. Unbelievable.
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You don't need to save ALL the weapons. I only save the ones that looks interesting (and current PvP meta) weapons.