400W is impressive, and in full sun this very large panel can achieve it. Worth considering if you don't need anything especially resilient or convenient.
Perhaps a bit large to be truly convenient, but good value and will get your phone, or other equipment back to life in a stitch.
The Jackery SolarSaga 100W Monocrystalline Solar Panel is durable and if the sun is strong it's an ideal way of creating off-grid, clean, renewable power
