This very unique fabric was woven by Dashing Tweeds in the UK.
It is a Lumatwill tweed which is a traditional tweed woven with a repeated 3M reflective yarn.
These yarns are the lighter horizontal stitches in the fabric which are highly reflective, making your bag (and yourself) very visible at night - perfect for cycling.
The Ben Loyal Tweed is part of Dashing Tweeds latest collection which was inspired by the history of Arctic exploration where the use of textiles like tweeds were crucial.
Each fabric is named after the high points of Britain, in this case Ben Loyal in the Scottish Highlands.