Abstract: In one embodiment, an enclosure comprises: a cover comprising a plastic material and a base comprising a plastic material. The base comprises a chamfered portion, and a rib extending longitudinally, substantially parallel with the longitudinal walls. In another embodiment, the enclosure comprises: a cover comprising a plastic material, and a base comprising a plastic material. The bottom portion of the base comprises a rib configured to subsequently receive a support material. In yet another embodiment, the enclosure comprises: a cover, a base, and a vent comprising a one way valve and configured to release gas from the enclosure. The base comprises a guide configured to receive the cover peripheral edge. The guide has a receiving portion having a receiving portion height and an aligning portion having a aligning portion height, and wherein the receiving portion height is less than or equal to about 70% of the aligning portion height.