You need open wire style containers or shelves, not ones with solid bottoms. The cold comes down from the top. Solid shelves will block the air from circulating and the cold going down. Items under the solid containers or shelves will be warmer and spoil.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.