To get more backpack space with diamonds:Open your backpack (or bank box, same process), click on page 3, 4, 5 or 6 (2, 3, 4 or 5 for bank box), click on Rental Function button (Clock icon), then select the amount of days you want. Also remember that you have an Item Shop backpack and Item Shop Bank Box page - those are for Item Shop items only.I am a new player (lvl 10) who just started a few days ago so I don't have much to suggest. But I have found that my backpack keeps filling up so I have been destroying gear and runes and buffs and hoping I won't need these things later. The shortage of space became so annoying (I can't even accept the daily login bonus because I have no room for it) and the game kept prompting me to go to the item shop to expand my backpack. I went there and saw that the backpack expansions were priced in rubies which I assumed were a subsidiary currency worth less than diamonds, but this seems not to be the case. I spent a few dollars to buy diamonds so I could expand my backpack but now I can't find any way to buy a backpack expansion with diamonds or in-game gold. Is there a way to expand my backpack with diamonds or is this a really bad game design?