Maize is prone to insect pests during grain storage, leading farmers to rely on synthetic insecticides. However, the use of these chemicals has been associated with insect resistance and negative impacts on non-targeted species. The adoption of hermetic principles for pesticide-free grain storage is globally recognized as a sustainable and environmentally friendly alternative to synthetic pesticides. To address losses in stored maize, trials were conducted at Bako, West Ethiopia to compare the effectiveness of pesticide-free hermetic grain storage and traditional polypropylene bags in terms of quantitative losses and seed quality, including germination potential, after three and six months of storage. The on-station trial followed a completely randomized design with three replicates of three treatments: Metal silo, PICS bag, and polypropylene bags without synthetic insecticide. On-farm trials with the same treatments were replicated on four smallholder farms, allowing natural insect infestation. Samples were assessed for total insect count, insect mortality, grain moisture content, grain damage, weight loss, and germination percentage. The results showed that hermetic treatments effectively controlled insect development, grain damage, and weight loss compared to non-hermetic treatments, with significant differences (P<0.05) observed. Seed viability was maintained in hermetic treatments, with high germination percentages (>92%) compared to non-hermetic treatments (<72%). There were no significant differences in grain moisture content among the storage methods. Overall, hermetic storage technologies proved effective in suppressing insect development, reducing losses, and preserving seed viability without the use of insecticides. These findings support the adoption of hermetic storage by small-scale farmers to improve food security and income generation in the country.