Quester's Satchels are rewards given in certain repeatable daily quests, that contain random bonus rewards. This rewards may be gems, seeds to different plants, gold, runes, and many others. Any satchel given will open right after being given, and the reward will be presented right then.
Character Gear (Cone of Shame, ...)
Lucky Rabbit Foot (Natalie Dragon Quest Trophy Item)
(*)Amount of Super Blueberry seeds you get is dependent on character level and is equal to (Lev/10) rounded up. So it means on level 184 you get 19 seeds. Currently there is no known max limit of seeds you can have in inventory, but you will not get super blueberries in a satchel if you already have 25 or more in your inventory.