EmberLit builds pack-flat wood burning camp stoves in the USA, and this page carries the three core models from the company that started the category. Each one slots panels together into a side-feeding firebox, runs on twigs gathered on site instead of fuel canisters, and breaks back down completely flat for the pack. The side-feed door is the design that matters: slide long sticks in as they burn instead of snapping everything to length, and the flame stays steady on seconds of fuel gathering. All three are made by Merkwares, the small American shop the entire twig stove category copied, and backed by the Forever Happiness guarantee.
The titanium FireAnt is the three-ounce solo pick, and the most fuel-flexible: it ships with a solid fuel tray and its slots seat a Trangia or Esbit burner when fire bans or soaked wood force a change. The Ultra-Lite reworks the full-size firebox in titanium at half the stainless weight, taking longer sticks and wide pots without crossbars. The Original in 304 stainless is the heaviest, cheapest, and toughest, happy under a Dutch oven at base camp. Pair any of them with a Exotac ferro rod and the fuel-free fire kit is complete. Titanium panels can take a slight warp with use, which is normal and never affects assembly.