Rainy season. Even if you think you can protect your body with an umbrella, the backpack on your back gets soaked. I can't see it, so I don't know how much it's raining.
I would like to recommend the "rucksack cover" that I found at 100-yen Can Do for those who are rucksacks. A polyester backpack cover that repels water. The color is simple all black.
The mechanism is the same as the shampoo cap. It has rubber in the mouth and can be easily attached. If you wrap the sides completely, only the shoulder straps are exposed.
The size when unfolded is about 50 x 34 cm. The corresponding backpack has a capacity of about 15 to 25L.
It's definitely crumpled, but it's a little matte and not too shiny, so I don't think it's strangely noticeable.
A cover that protects your backpack from water splashes when riding a bicycle after the rain, as well as commuting to work or school on a rainy day. It folds compactly when not in use, so why not carry it with a folding umbrella?