I keep running into 6 slotted pants. Fill them, then drop that pair of pants in another pair of pants. It takes up four inventory slots for the pants that have 6 full slots in it. You also have two left over slots for even more gear. When this pair is full, find another pair of pants and drop your current ones in it. This is repeatable forever.
Note, you can't actually drop the pants into other pants from the TAB inventory screen, you have to pick them up from the ground and make sure they only fit in your current pants.