Regarding the bag for the porter; he will be happy to carry one bigger bag rather than two small bags. If you already have a rucksack, please bring your rucksack rather than the duffle bag. A rucksack (50 to 70 liters) is better to carry for the porter. But if you don’t have a rucksack, no problem bringing whatever you have got. We at Nepal Mother House also provide the duffle bag entire trip if you needed. For the day bag; you need each of you a day bag (15 to 30 liters) to keep in your valuable things and water.