Guild Wars 2

Preferably anything that you’re required to collect a large amount of in order to make use of them; like the blood rubies, petrified wood and (as mentioned earlier) blade shards.
Similar for rarer items that are only used as a currency/tokens but you wouldn’t collect a lot of. Having one or 2 of these on you might seem minor at first but they add up when from a number of different zones.
Having a separate part of bags for items used in WvW would be handy. Blueprints are pretty important but having a lot on me when I’m not in WvW means I automatically waste a few spaces.
This would best be handled as a WvW only bag that doesn’t accept items other than traps or blueprints.
Items which act as keys would be helpful if they where also in a separate bag (chak acid, bandit key…). Items which combine into a key could go here too.

I could go probably go into how items like runes could also have their own places but I think the ones mentioned above are important and consuming enough to be worth the attention.

Thanks to the new achievement layout and chests there are a select few items we can unlock to re-skin some weapons and armor, it would be great if we were able to use this panel to re-acquire some of the items we have gathered from doing the living story such as the Sclerite Karka Shell, fused gauntlets or mad kings memoirs.
I’m sure there are many people that have mistakenly removed the items or transfused the wrong skin.

This would also allow future items to unlock on the panel instead of take another inventory/bank slot. Minipets are obviously fine since they have a bank space.