This study explores the influence of soft drink packaging design—focusing on Coca-Cola, Fanta, and Sprite—on cognitive load and visual engagement among consumers. By examining the relationship between packaging aesthetics and consumer psychology, the research aims to uncover how visual stimuli evoke emotional responses and guide purchasing decisions in a competitive market. A total of 28 participants were presented with various packaging designs, including cans, bottles, and a control image, while Left Pupil Dilation (LPD), Right Pupil Dilation (RPD), and Blink Rate per Minute (BKPMIN) were measured to assess cognitive load and emotional arousal. Statistical analyses, including t-tests and ANOVA, revealed significant differences in visual engagement and cognitive load across packaging types. Coca-Cola bottles elicited higher pupil dilation (mean LPD: 16.48) compared to cans (15.30), while Fanta cans (15.47) outperformed bottles (14.70). For Sprite, cans (11.84) induced greater dilation than bottles (11.19). Blink rate analysis further highlighted differences in cognitive load, with Coca-Cola bottles showing a higher blink rate (11.28 bpm) compared to cans (8.56 bpm). Fanta cans (14.33 bpm) exceeded bottles (11.53 bpm), whereas Sprite bottles exhibited notably lower blink rates (2.52 bpm) than cans (10.22 bpm). These findings suggest that soft drink cans, particularly for Coca-Cola and Fanta, promote greater visual engagement and lower cognitive load than bottles, emphasizing the critical role of packaging design in shaping consumer perception and behavior.