A lot of guys are liking the Tilley hats these days fit Sun protection, however I don't they'd be very practical in conjunction with a backpack. I'd think the brim would be to rigid. Good colors though. http://www.tilley.com/canada_en/shop_men?cat=44&t_filter_category=206
I have an LTM6 and wear it backpacking all the time. The brim is not stiff at all.
Regards,
Scott