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A bulk container comprises a one piece base, a cap and a peripheral side wall. The base includes a generally rectangular bottom wall, a plurality of longitudinal rails extending below the bottom wall, and a peripheral wall extending upwardly from the bottom wall. The peripheral wall defines an upwar

A bulk container comprises a one piece base, a cap and a peripheral side wall. The base includes a generally rectangular bottom wall, a plurality of longitudinal rails extending below the bottom wall, and a peripheral wall extending upwardly from the bottom wall. The peripheral wall defines an upwardly opening channel. The cap includes an inner wall connected to an outer wall defining a downwardly opening channel complimentary with the upwardly opening channel. The peripheral side wall is received in the upwardly opening channel and the downwardly opening channel to define a parallelepiped interior space.

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1. A bulk container comprising: a one piece base including a generally rectangular bottom wall, a plurality of longitudinal rails extending below the bottom wall, and a peripheral wall extending upwardly from the bottom wall, the peripheral wall defining an upwardly opening channel;a cap including a

1. A bulk container comprising: a one piece base including a generally rectangular bottom wall, a plurality of longitudinal rails extending below the bottom wall, and a peripheral wall extending upwardly from the bottom wall, the peripheral wall defining an upwardly opening channel;a cap including an inner wall connected to an outer wall defining a downwardly opening channel complementary with the upwardly opening channel; anda peripheral side wall received in the upwardly opening channel and the downwardly opening channel to define a parallelepiped interior space. 2. The bulk container of claim 1 wherein the base includes a network of reinforcing ribs extending downwardly from the bottom wall. 3. The bulk container of claim 1 wherein the base is of one piece plastic construction. 4. The bulk container of claim 1 wherein the peripheral side wall comprises a corrugated wall. 5. The bulk container of claim 1 wherein the peripheral side wall comprises interlocking wall elements. 6. The bulk container of claim 1 wherein the interior space has a volume of about 300 gallons. 7. The bulk container of claim 1 wherein the base peripheral wall comprises a double wall including an inner wall portion and an outer wall portion defining the upwardly opening channel. 8. The bulk container of claim 7 wherein the base inner wall portion is connected to the bottom wall periphery by a curved wall portion to provide a smooth transition from the bottom wall to the inner wall portion. 9. The bulk container of claim 1 further comprising a removable cover receivable on the cap. 10. The bulk container of claim 9 wherein the cover comprises longitudinally extending raised wall portions for supporting rails of a base for stacking bulk containers. 11. A bulk container comprising: a one piece plastic base including a generally rectangular bottom wall, a plurality of longitudinal rails extending below the bottom wall, and a peripheral wall extending upwardly from the bottom wall, the peripheral wall defining an upwardly opening channel;a peripheral side wall including a bottom end and a top end, the bottom end received in the upwardly opening channel to define a parallelepiped interior space;a cap including an inner wall connected to an outer wall defining a downwardly opening channel receiving the top end of the peripheral side wall, the base peripheral wall and the cap reinforcing the bottom and top ends of the peripheral side wall; anda removable cover receivable on the cap to close the interior space. 12. The bulk container of claim 11 wherein the base includes a network of reinforcing ribs extending downwardly from the bottom wall. 13. The bulk container of claim 11 wherein the base is of one piece plastic construction. 14. The bulk container of claim 11 wherein the cover is of one piece plastic construction. 15. The bulk container of claim 11 wherein the cover comprises longitudinally extending raised wall portions for supporting rails of a base for stacking bulk containers. 16. The bulk container of claim 11 wherein the peripheral side wall comprises a corrugated wall. 17. The bulk container of claim 11 wherein the peripheral side wall comprises interlocking wall elements. 18. The bulk container of claim 11 wherein the interior space has a volume of about 300 gallons. 19. The bulk container of claim 11 wherein the base peripheral wall comprises a double wall including an inner wall portion and an outer wall portion defining the upwardly opening channel. 20. The bulk container of claim 19 wherein the base inner wall portion is connected to the bottom wall periphery by a curved wall portion to provide a smooth transition from the bottom wall to the inner wall portion.