I carry my helmet on my head. No need to put in in the saddle bag. I tried to get it in there once and it will fit, but it was hard on the hinges.

I packed for ten days using just the saddle bags. Right side holds two pairs of pants, socks, underwear, T-shirts, toiletries and a pair of flip flops.

Left side is a hoodie, rain gear, gloves and all the things that stay in there like bungees, tire repair kit with pump, glass cleaner, rags, whiskey flask etc.

I thought for a while about putting my givi case from my other bike on the B, but have not had the need yet.