Panel Capacity
9 × 12 in (8x10 also fits)
Palette Size
9 × 12 in (integrated)
Tripod Mount
1/4-20 thread (universal)
Material
Cherry wood, brass hardware
Closed Dimensions
10 × 13 × 3 in
Weight
3.5 lbs
Country of Origin
USA (Pennsylvania)
Pros
- Cherry wood — develops the patina cheap pochades can't replicate
- Magnetic mast holds canvas without finger-screws or knobs
- Brass hardware throughout — won't corrode in coastal painting conditions
- Workshop-built, hand-finished, every unit slightly unique
- Lifetime warranty from the maker
Cons
- Cherry wood needs annual mineral-oil treatment
- 4-6 week lead time on popular configurations
- Magnetic mast adds $30 — worth it but not optional
The Open Box M is what happens when a working plein air painter spends 20 years refining a single piece of equipment. James Coulter started building these in his Pennsylvania workshop in the early 2000s. Every box is built to order. Every box passes through his hands.
The magnetic mast is the feature that separates Open Box M from every competitor. Other pochade boxes use friction-clamp masts — thumbscrews you tighten down on the canvas. The Open Box M uses a magnetic system: place the canvas against the mast, the magnets grab and hold, no fumbling with cold hands at sunrise.
9 × 12 panel capacity is the plein air sweet spot. Smaller than that and you can't capture compositional depth; larger than that and you can't carry it on a hike. 90% of working plein air painters work at 8 × 10 or 9 × 12.
Our Pick
The artisan-made cherry wood pochade box that working plein air painters refuse to leave home without. 9x12 panel capacity, integrated palette, magnetic mast — the design has been refined for 20 years.
Buy this if you paint plein air more than once a month, you work in oils or thick acrylic, or you want a pochade you'll still be using in 2046. Open Box M is small-batch built in a Pennsylvania workshop — every box passes through one craftsman's hands.
What we don't like
Cherry wood needs occasional re-oiling — once a year you'll spend 10 minutes wiping it down with mineral oil. Lead time can hit 4-6 weeks on Amazon for the most popular configurations. And the magnetic mast is glorious but adds $30 to the price.
