We bought the school backpack for our son for 1st class. It is normal for an average built (not extremely large, small, petite, thick, etc.) and can handle your backpacking. He goes on a full-time school and it fit two bottles purely on the side, if you let the zippers open. Inside is enough space for all the things that he used. Also for both lunch boxes. The many small pouch at the front I find unnecessary. Really we do not know what is in there. For the wallet a small compartment is easily hidden attached above. , There are a small backpack sports bag and a pencil case (empty) this. The supplied Turnbeutel may still go, but the pencil case is completely unusable. We just bought a nice another Scout. Compared to other knapsack the price is ok, so I then also spend the money for a decent pencil case. A rain cover is not included. We bought the right of Jack Wolfskin, which also reflected properly. Conclusion: the satchel is really handy and robust, but the accessories you have yet to buy time.
