Creating storage space in a closet with a slanted ceiling will require thinking about storage options. For example, you might have to raise or lower a hanging rod. Or, you might have to use the space for folded clothes only. You can store items in a methodical fashion and find what you need by designing areas under the slanted areas and under eaves.
Figure out the most linear space you have for a hanging rod. Hang a double rod if the ceiling is high enough. Define the clothes hanging area so you can plan storage shelves and stacked storage units around the rod area. Install hanging rods by attaching the metal hardware via 4-inch stainless steel screws secured to wall studs. Never hang a rod with just anchor bolts into drywall.
Design storage for seldom-used items in the far recesses of the closet. Store Christmas decorations, wrapping paper or an old trunk with college items in the furthermost eaves area of a closet with a slanted ceiling. Place holders for shoes or stacked units with drawers to hold sweaters or camping gear within arm's reach of the front of the closet.
Use side space effectively. Secure a few hanging hooks on the sides or along the back for purses, a backpack or raincoats. Hang a small shelf system on the wall to hold boxes of ties, jewellery or scarves that are seldom used. Toys can be stored in mesh bags and placed on hooks.
Install shoe racks on the floor area at the front of the closet. Buy shoe storage that can be quickly rolled out or pulled out to allow you to reach deeper into the closet. Place a vinyl tub/container for dirty laundry on the floor area near the door. Use a second vinyl container to toss miscellaneous items you need to sort at a later date, instead of just tossing the items into the closet.
Use the closet to help you keep the room in which the closet is located neat. Assign the hanging rods for sweaters, coats and raincoats if the closet is near an entrance door from the outside. If the room is a bedroom, store blankets and linen in the closet's deeper recesses, while leaving the front for clothing and shoes.
Place a list of what's in the closet on the interior of the closet door. Make a list of winter coats, Christmas decorations, kitchen items, tools, clothing or supplies stored. Laminate and attach the list to a clipboard, to refer to when trying to remember what's stored.
Never store food items in an eaves area. For example, groceries might attract rodents or bugs if you leave them in a seldom-used dark area. Always put a light in a closet, even if it's battery powered, so you can see what you're reaching for. If there is no hanging space, since the ceiling is too slanted, don't overload the closet with items. A closet piled full becomes a catch-all instead of good storage space.