Backpack for helmet and stuff

Hello! I need advice on a multi-purpose backpack. I ride a KLX 250, I always carry a backpack to carry things like spare thermal layers, a laptop for the commute, some food. I almost never travel without it. The only problem is that I can't carry a spare helmet in it, and I don't like leaving it on the bike. So I was looking for a good mid-sized backpack that can carry a helmet.

Regular backpacks just don't work here, and leaving a helmet on the bike is kind of scary. I bought myself a motorcycle helmet backpack with a large special compartment. I liked that it has a USB port, so you can charge your phone on the go. The material is waterproof, so nothing gets wet in the rain. And in general, it's comfortable to carry, the straps are wide, your back doesn't get tired.