I will be going to a series of 6 to 10 hours day hikes in Hokkaido, Japan. Some of these hikes are strenuous in effort, and involves different terrains. The weather should include some rain, but for the most part it will be hot, and humid. I will be there from the end of July till the end of August. I will have my own car as a transportation going through Hokkaido.
I have a 70L Outdoor backpack that I usually travel with, but I am NOT planning on doing the hikes with my 70L backpack (tried doing so through Indonesia and Taiwan for multi-day hikes, and it was tough, silly me).
I am thinking of buying two of a lightweight packable (or foldable) backpacks (like this). Then before the hike I was thinking to leave the 70L backpack and use the foldable backpack for the day hike. I will also buy a waterproof cover for the foldable backpack.
I expect that I will be carrying a maximum of 4kg to 5kg. I will have my snacks (and/or meal), 1.5L to 2L of water depending on the hike, a shirt, headlights, and a waterproof jacket.
Does this sound like a good idea? Also, any possible alternatives for a reliable packable/foldable backpack? (even if it is expensive)