Smart Baking Company SmartBun is a gluten free, low calorie, low carb burger bun with protein, fiber, and zero net carbs per bun. Lightly sweetened with erythritol, SmartBuns are high in fiber and Omega-3 fatty acids, and made with non-GMO ingredients. These low carb, keto-friendly hamburger buns are individually wrapped and each SmartBun counts as only 1 point on Weight Watchers SmartPoints. Recommended Storage: Smartbuns must be refrigerated upon arrival, to last for up to 2 weeks. Or stored in the freezer for a longer shelf life and optimal freshness. Smartbuns can be thawed at room temperature or can be toasted directly from the freezer in a regular toaster. Toasting takes less time than standard bread.