The design is the features of shape and ornamentation of the storage container as shown in the drawings.Drawings of the design are included.FIG. 1 is a top perspective view of a storage container showing a first variant of the design;FIG. 2 is a side elevational view of the narrow side of the first variant, the opposite side elevational view being identical;FIG. 3 is a top plan view of the first variant;FIG. 4 is a side elevational view of the wide side of the first variant, the opposite side elevational view being identical;FIG. 5 is a bottom plan view of the first variant;FIG. 6 is a top perspective view showing a second variant of the design;FIG. 7 is a side elevational view of the narrow side of the second variant, the opposite side elevational view being identical;FIG. 8 is a top plan view of the second variant;FIG. 9 is a side elevational view of the wide side of the second variant, the opposite side elevational view being identical;FIG. 10 is a bottom plan view of the second variant;FIG. 11 is a top perspective view showing a third variant of the design;FIG. 12 is a side elevational view of the narrow side of the third variant, the opposite side elevational view being identical;FIG. 13 is a top plan view of the third variant;FIG. 14 is a side elevational view of the wide side of the third variant, the opposite side elevational view being identical;FIG. 15 is a bottom plan view of the third variant;FIG. 16 is a top perspective view showing a fourth variant of the design;FIG. 17 is a side elevational view of the narrow side of the fourth variant, the opposite side elevational view being identical;FIG. 18 is a top plan view of the fourth variant;FIG. 19 is a side elevational view of the wide side of the fourth variant, the opposite side elevational view being identical;FIG. 20 is a bottom plan view of the fourth variant;FIG. 21 is a top perspective view showing a fifth variant of the design;FIG. 22 is a side elevational view of the narrow side of the fifth variant, the opposite side elevational view being identical;FIG. 23 is a top plan view of the fifth variant;FIG. 24 is a side elevational view of the wide side of the fifth variant, the opposite side elevational view being identical;FIG. 25 is a bottom plan view of the fifth variant;FIG. 26 is a top perspective view showing a sixth variant of the design;FIG. 27 is a side elevational view of the narrow side of the sixth variant, the opposite side elevational view being identical;FIG. 28 is a top plan view of the sixth variant;FIG. 29 is a side elevational view of the wide side of the sixth variant, the opposite side elevational view being identical;FIG. 30 is a bottom plan view of the sixth variant;FIG. 31 is a top perspective view showing a seventh variant of the design;FIG. 32 is a side elevational view of the narrow side of the seventh variant, the opposite side elevational view being identical;FIG. 33 is a top plan view of the seventh variant;FIG. 34 is a side elevational view of the wide side of the seventh variant, the opposite side elevational view being identical;FIG. 35 is a bottom plan view of the seventh variant;FIG. 36 is a top perspective view showing an eighth variant of the design;FIG. 37 is a side elevational view of the narrow side of the eighth variant, the opposite side elevational view being identical;FIG. 38 is a top plan view of the eighth variant;FIG. 39 is a side elevational view of the wide side of the eighth variant, the opposite side elevational view being identical;FIG. 40 is a bottom plan view of the eighth variant;FIG. 41 is a top perspective view showing a ninth variant of the design;FIG. 42 is a side elevational view of the left side of the ninth variant, the right side elevational view being identical;FIG. 43 is a top plan view of the ninth variant;FIG. 44 is a side elevational view of the front side of the ninth variant, the rear side elevational view being identical;FIG. 45 is a bottom plan view of the ninth variant;FIG. 46 is a top perspective view showing a tenth variant of the design;FIG. 47 is a side elevational view of the left side of the tenth variant, the right side elevational view being identical;FIG. 48 is a top plan view of the tenth variant;FIG. 49 is a side elevational view of the front side of the tenth variant, the rear side elevational view being identical;FIG. 50 is a bottom plan view of the tenth variant;FIG. 51 is a top perspective view of the storage container showing an eleventh variant of the design;FIG. 52 is a side elevational view of the narrow side of the eleventh variant, the opposite side elevational view being identical;FIG. 53 is a top plan view of the eleventh variant;FIG. 54 is a side elevational view of the wide side of the eleventh variant, the opposite side elevational view being identical;FIG. 55 is a bottom plan view of the eleventh variant;FIG. 56 is a top perspective view showing a twelfth variant of the design;FIG. 57 is a side elevational view of the narrow side of the twelfth variant, the opposite side elevational view being identical;FIG. 58 is a top plan view of the twelfth variant;FIG. 59 is a side elevational view of the wide side of the twelfth variant, the opposite side elevational view being identical;FIG. 60 is a bottom plan view of the twelfth variant;FIG. 61 is a top perspective view showing a thirteenth variant of the design;FIG. 62 is a side elevational view of the narrow side of the thirteenth variant, the opposite side elevational view being identical;FIG. 63 is a top plan view of the thirteenth variant;FIG. 64 is a side elevational view of the wide side of the thirteenth variant, the opposite side elevational view being identical;FIG. 65 is a bottom plan view of the thirteenth variant;FIG. 66 is a top perspective view showing a fourteenth variant of the design;FIG. 67 is a side elevational view of the narrow side of the fourteenth variant, the opposite side elevational view being identical;FIG. 68 is a top plan view of the fourteenth variant;FIG. 69 is a side elevational view of the wide side of the fourteenth variant, the opposite side elevational view being identical;FIG. 70 is a bottom plan view of the fourteenth variant;FIG. 71 is a top perspective view showing a fifteenth variant of the design;FIG. 72 is a side elevational view of the narrow side of the fifteenth variant, the opposite side elevational view being identical;FIG. 73 is a top plan view of the fifteenth variant;FIG. 74 is a side elevational view of the wide side of the fifteenth variant, the opposite side elevational view being identical;FIG. 75 is a bottom plan view of the fifteenth variant;FIG. 76 is a top perspective view showing a sixteenth variant of the design;FIG. 77 is a side elevational view of the narrow side of the sixteenth variant, the opposite side elevational view being identical;FIG. 78 is a top plan view of the sixteenth variant;FIG. 79 is a side elevational view of the wide side of the sixteenth variant, the opposite side elevational view being identical;FIG. 80 is a bottom plan view of the sixteenth variant;FIG. 81 is a top perspective view showing a seventeenth variant of the design;FIG. 82 is a side elevational view of the narrow side of the seventeenth variant, the opposite side elevational view being identical;FIG. 83 is a top plan view of the seventeenth variant;FIG. 84 is a side elevational view of the wide side of the seventeenth variant, the opposite side elevational view being identical;FIG. 85 is a bottom plan view of the seventeenth variant;FIG. 86 is a top perspective view showing an eighteenth variant of the design;FIG. 87 is a side elevational view of the narrow side of the eighteenth variant, the opposite side elevational view being identical;FIG. 88 is a top plan view of the eighteenth variant;FIG. 89 is a side elevational view of the wide side of the eighteenth variant, the opposite side elevational view being identical;FIG. 90 is a bottom plan view of the eighteenth variant;FIG. 91 is a top perspective view showing a nineteenth variant of the design;FIG. 92 is a side elevational view of the left side of the nineteenth variant, the right side elevational view being identical;FIG. 93 is a top plan view of the nineteenth variant;FIG. 94 is a side elevational view of the front side of the nineteenth variant, the rear side elevational view being identical;FIG. 95 is a bottom plan view of the nineteenth variant;FIG. 96 is a top perspective view showing a twentieth variant of the design;FIG. 97 is a side elevational view of the left side of the twentieth variant, the right side elevational view being identical;FIG. 98 is a top plan view of the twentieth variant;FIG. 99 is a side elevational view of the front side of the twentieth variant, the rear side elevational view being identical;FIG. 100 is a bottom plan view of the twentieth variant;FIG. 101 is a top perspective view of the storage container showing a twenty-first variant of the design;FIG. 102 is a side elevational view of the narrow side of the twenty-first variant, the opposite side elevational view being identical;FIG. 103 is a top plan view of the twenty-first variant;FIG. 104 is a side elevational view of the wide side of the twenty-first variant, the opposite side elevational view being identical;FIG. 105 is a bottom plan view of the twenty-first variant;FIG. 106 is a top perspective view showing a twenty-second variant of the design;FIG. 107 is a side elevational view of the narrow side of the twenty-second variant, the opposite side elevational view being identical;FIG. 108 is a top plan view of the twenty-second variant;FIG. 109 is a side elevational view of the wide side of the twenty-second variant, the opposite side elevational view being identical;FIG. 110 is a bottom plan view of the twenty-second variant;FIG. 111 is a top perspective view showing a twenty-third variant of the design;FIG. 112 is a side elevational view of the narrow side of the twenty-third variant, the opposite side elevational