Filson has been making bags in Seattle since 1897. The Tin Cloth line uses a proprietary waxed cotton developed for the Pacific Northwest fishing industry - a material that repels rain, resists abrasion, and builds a patina over years of use rather than showing wear.
The Zipper Tote is the practical version of an already practical object. A heavy-duty YKK metal zipper closes the top; two exterior stow pockets sit flat against the front panel. The main compartment is nylon-lined for easy cleaning, with enough room for a laptop, a change of clothes, and whatever else you are carrying that day. Cotton webbing handles are long enough to sling over a shoulder.
The Otter Green is the right colour - muted enough to work with almost everything, distinct enough that you know exactly where it is in a pile of bags. It will look better at five years than it does at purchase.
At £279 this sits in the premium-but-sensible bracket for a bag that should last a decade or more. Filson offers a lifetime guarantee on all Tin Cloth products. That is a meaningful guarantee from a company that has been around since before the Klondike Gold Rush.