Otmar will sell you general items such as old tools, Fertilizer, and animal feed. In general, his inventory is the same throughout the year, but he will rotate in a few basic crop seeds each season. Otmar will upgrade your beginner-level rucksack for a fee. Your starting rucksack will hold up to 50 items, but if you need more space, the shopkeeper will have a 70-slot bag available for 100,000 G. After you purchase the large bag upgrade, he'll then have a 100-slot bag for 500,000 G. Remember, when playing in Seedling Mode the prices will be 30% less.