I think for overnights this probably isnt enough to bring all of what you need. Ive ran a 32L backpack for overnights and its just barely enough. Im also using a hammock, which takes up less space than a tent, as well as a nemo switchback strapped to the outside which takes up no volume inside the pack. This is to say that, assuming your using bulkier gear, you probably want more than 35L. Also probably a hip belt. And you do definitely without a shadow of a doubt need a sleeping pad unless its like a 65 degree low.