I want to travel for about 20 days and buy a mountaineering bag. How about the CROSS 45L bag?

45 liters shouldn't be big, but this is a bit embarrassing. You think it's too big as an ordinary self-help backpack, generally 30/35 is enough, and the mountaineering bag is too small. Generally, it is not less than 55 liters to go outdoors, otherwise the tent is not easy to put. There is usually a special notebook bag in the mountaineering bag, but you need to buy a notebook metal box. The mountaineering bag has a good carrying system, and the 45-liter mountaineering bag has a carrying system. Cross is an entry-level bag with high cost performance. You can buy the real thing for less than 300.