Do this:

Step 1: Throw out or sell gear you're not using and won't using from class quests or convert them into materia if you have full bond.
Step 2: Throw out or sell raw material you won't be using, if you're not a cook you have no reason to be lugging around raw meats.
Step 3: Utilize your retainers.
Step 4: Sell your Allagan coins.
Step 5: Stop looting everything just because it drops.

No one should have inventory issues unless they hoard everything lol. All in all, it was your fault for not checking your inventory space, you get a BIG popup in the top of your screen stating: "4 slots left....3 slots left....2 slots left...1 slot left...0 slots left.."

Quote Originally Posted by KojachLoT View Post
more like its 2013 why can your inventory even get full

its not like technology forces them to limit the size at all
Memory constraints - PC only MMOs have limitations in various areas still even if it's 2013.