Excess: pack overstocked and off-season items. If you’re selling your house in the summer then put away winter wear and sporting gear. Try to return excess to the store you bought it from; they might take it back.
Every room should have a clutter bin. This is where you stow away your everyday-use items. You can purchase these plastic containers just about anywhere. Encourage your family to use the bins as much as possible. Put them away in a convenient place (underneath the bed, in the pantry, etc.) before a showing. Buyers are curious people but they won’t open containers.