Topeak Pannier Drybag 24L £94.99
AT A GENEROUS 47CM tall x 31.5cm wide x 15cm deep, this can hold a full change of clothes, shoes plus my laptop and notebook on my commute. It’s also waterproof thanks to being fully welded with a Velcro-secured roll top (but not overly heavy, at 785g). The Handle Loc handle, when squeezed, opens the rack rail clamps