After exploring wasteland for more than 4 days rare items drop increase which is OK but they are not added to inventory because there is 100 item limit and is full of junk items from beginning of the exploration. Could you increase the inventory size or add drop/replace function for the junk items with rare or legendary ones? Else way there is no reason to explore more than 4d 4h which is not the longest they can stay there for high level, high stat dwellers.