This study was aimed at investigating the effect of storage on some properties of selected soft drinks sold in Nigeria.Two different brands of PET bottled carbonated soft drinks were analyzed for the effect of storage on the pH, titrable acidity, specific gravity, total soluble solids content(TSSC) and antimony leaching using standard methods. Five bottles of the samples were kept at room temperature while five samples were exposed to sunlight. The drinks were analyzed after 3, 6, 9, 12 and 15 weeks of storage using standard methods. One bottle of each brand was analyzed immediately before storage and they served as control. The results of the analyses show that the pH of the samples decreased with time, the TSSC, the specific gravity, the total acidity and the rate of antimony leaching of the samples increased with storage time. Under sunlight condition, the antimony concentration for sample 1 after 15 weeks of storage increased from 0.002- 0.015ppm, while that of sample 2 increased from 0.001-0.007ppm. However, for the samples that were not exposed to sunlight, the antimony concentration for sample 1 increased from 0.003-0.011ppm, while the antimony concentration in sample 2 increased from 0.001-0.003ppm, which is below WHO permissible limit of 0.006ppm. For the samples exposed to sunlight, the acidity of sample 1 increased from 0.008–0.032% while that of sample 2 increased from 0.025 – 0.034% and the acidity for the samples stored at room temperature increased from 0.008 -0.194% and 0.025 -0.031 for samples 1 and 2 respectively. At room temperature condition, the TSSC was found in sample 1 to be 14.96% and 0.248 in sample 2 at the 15th week. For the samples exposed to sunlight, the TSSC was found to increase from 12.37–14.96 and 0.000–0.260 in sample 1 and sample 2 respectively at the 15th week. The Specific gravity for exposed samples at the 15th week increased from 0.9921- 1.0012 in sample 1 and 0.9999 – 1.0014 in sample 2 while for the room temperature samples, it increased from 0.9921 – 1.0010 in sample 1 and 0.9999 –1.0013 in sample 2. The highest decrease in pH was found in sample 2 (4.06 – 3.98) at the both storage conditions.