Great weather for trekking...
I am offering this Evernew Route 33 backpack with cooking utensils (portable gas stove, solid fuel stove, foldable frying pan, spatulas, plastic plates, etc.). It's lightweight but sturdy, and holds everything you need with the useful pockets and 50 liter carrying capacity. JPY5,000 ONO.
Can deliver to JR Yokohama / Shinagawa stations.