>>2859339it is. i recently got a 30L backpack that I think is amazing, however for day use it is too big. the hip straps can't be removed, so they are always sort of in the way and the volumne is just too much. backpacks are more comfortable if they are filled at least to a certain degree. they do need some weight to push them down for example.
now i am gonna use this backpack for longer dayhikes and multiday hikes or if i need to carry stuff when i will be staying overnight somewhere. for general day use i have 2 backpacks, one small leather backpack that has a volumne of about 10 litres and one 20 litre military style backpack that i intend to replace with something else, non military, in 20 litres. i think 20 litres is a pretty good size for day use, you can carry a few things and also have enough space should you need more.
i almost got a 40L backpack when i bought the 30L and I am glad i did not. i like the 30L so much, that i will still keep it, and probably get something else from the same brand. i am just impressed with the quality and features of the whole thing.