A tool caddy for providing a tool carrier that is rugged and holds a large number of tools. The tool caddy includes a main tool storage unit having an upper opening into an interior and comprising a core section having a pair of side walls and a bottom wall extending between the side walls. A filler wall is mounted over the side wall opening of the core section with each of the filler walls being substantially coplanar with one of the side walls. A strap is mounted on the storage unit for suspending the storage unit from a user's body.