carbonaut low carb hamburger buns, non-gmo, vegan, sugar free, keto buns (4 pack) carbonaut put hamburger buns back into your orbit. with carbonaut’s bun-baking magic, our hamburger buns will satisfy your craving and even make you feel like you’re cheating. but no worries, you’re on track with our 3 grams of net carbs, 12 grams of fiber and 11 grams of protein. 100% plant-based, and keto certified, carbonaut hot dog buns continue to expand the low carb universe!