Double Stack: Allergens at a Glance
The honest verdict
Double Stack · Jack in the Box
The Double Stack is a two-beef-patty burger with American cheese, ketchup, mayonnaise, and a sesame seed bun. The allergen profile is anchored by wheat from the bun, milk from the cheese, egg and soy from the mayonnaise, and sesame from the bun. Peanut, tree nut, fish, and shellfish are not typical ingredients. The Double Stack is a smaller, more streamlined burger than the Jumbo Jack (single patty, no cheese) or the Ultimate Cheeseburger (bacon, extra toppings). Always confirm with your specific Jack in the Box location before ordering, as recipes and suppliers vary by region.
Allergen details change and vary by location. This is a general guide — always confirm with the restaurant before ordering. Not official or medical advice.
Key facts
The Double Stack is a two-patty burger with American cheese, ketchup, mayonnaise, and a sesame seed bun — a streamlined version of the Ultimate Cheeseburger.
The FASTER Act (2023) added sesame as the 9th major food allergen, requiring clear labeling on packaged foods and restaurant menus.
FDA — Food Allergen Labeling and Consumer Protection Act (FALCPA)
Mayonnaise is made with egg yolks and soybean oil, making it a source of both egg and soy allergens in fast-food burgers.
Every major allergen, one clear grid
Each of the nine major allergens marked for Double Stack at Jack in the Box — Contains, May contain (cross-contact or varies), or Free. Anything we couldn't confirm defaults to "may contain," because a shared kitchen can't be ruled out without the restaurant's official menu.
- MilkContains
American cheese is a standard ingredient on the Double Stack. Milk is a primary component of American cheese. The bun may also contain milk or butter depending on the bakery supplier.
- EggContains
Mayonnaise is a standard ingredient on the Double Stack. Mayonnaise is made with egg yolks. The bun may also contain egg depending on the recipe.
- Wheat / GlutenContains
The sesame seed bun is wheat-based. This is the primary source of gluten in the Double Stack. There is no standard gluten-free bun option at Jack in the Box.
- SoyContains
Soybean oil is used in the mayonnaise and likely in the bun. The beef patties may also contain soy-based fillers or binders. Soy is a common ingredient in fast-food burger components.
- PeanutFree
Peanut is not an ingredient in the Double Stack components. Peanut oil is not used in standard burger preparation at Jack in the Box.
- Tree NutFree
Tree nuts are not an ingredient in the beef patties, cheese, bun, or condiments on the Double Stack.
- FishFree
Fish is not an ingredient in the Double Stack. The burger is cooked on a flat-top grill, not a shared fryer, so fish cross-contact is unlikely.
- ShellfishFree
Shellfish is not an ingredient in the Double Stack and is not typical in burger preparation environments.
- SesameContains
The bun on the Double Stack is a sesame seed bun. Sesame seeds are a direct source of this allergen. The FASTER Act (2023) requires sesame to be labeled as a major allergen.
“May contain” means cross-contact is possible or the answer varies by location — not that the allergen is a listed ingredient. For a severe allergy, treat “may contain” the same as “contains” until the restaurant confirms otherwise.
Small changes that remove an allergen
Simple modifications that can take an allergen off your double stack. Always name your allergy when you order and ask staff to confirm — a modification only helps if the kitchen prepares it separately.
Order without cheese
Order without mayonnaise
Request a lettuce wrap instead of the bun
Order without the bun entirely (protein style)
A modification lowers exposure but doesn't erase cross-contact from shared fryers, grills, or prep surfaces. For a severe allergy, confirm the prep with a manager before you eat.
Read this before you order
Cross-contact & severe allergies
A “free of” mark on the grid above means the allergen isn't an ingredient — it doesn't mean the item was made in an allergen-free kitchen. Two things matter most:
Shared fryers & equipment
The beef patties are cooked on a flat-top grill that may also cook other items containing allergens. The same spatula or prep surface may contact cheese, buns, or other burger components. Cross-contact risk is moderate but present — especially for wheat and milk from shared surfaces. Ask the restaurant about dedicated preparation if you have a severe allergy.
If your allergy is severe
For anaphylactic allergy to wheat, milk, egg, soy, or sesame, confirm all ingredients and preparation practices with the specific Jack in the Box location before ordering. The Double Stack is not guaranteed safe for any of these allergens without restaurant-level confirmation. Carry your epinephrine auto-injector. If you cannot confirm preparation details, consider a simpler burger option with fewer components.
This guidance is general and can't account for how any single location prepares your food. The restaurant's staff and official allergen menu are the final word — when in doubt, ask, or choose something else.
❓Frequently Asked Questions
No. The sesame seed bun is wheat-based, making the standard Double Stack a direct source of gluten. There is no gluten-free bun option at Jack in the Box. A lettuce wrap or bunless order removes the wheat, but cross-contact from shared grill surfaces may still introduce trace gluten. Confirm with the restaurant whether they can prepare your burger on a clean surface.
Yes. The American cheese slice is a direct source of milk. The bun may also contain milk or butter depending on the supplier. Removing the cheese eliminates the primary dairy source, but the bun may still contribute trace milk. For a dairy-free order, request no cheese and ask about the bun ingredients.
The Double Stack has two beef patties and American cheese, while the Jumbo Jack has a single patty and no cheese. The Double Stack also includes mayonnaise, while the Jumbo Jack typically does not. The allergen profiles differ: the Double Stack adds milk (cheese) and egg (mayonnaise) that the Jumbo Jack may lack. Both use a sesame seed bun, so wheat and sesame are common to both.
No. The bun is topped with sesame seeds, making the Double Stack a direct source of sesame. Removing the bun eliminates the sesame risk, but confirm that no sesame-containing sauces or seasonings are used on the patties. The FASTER Act now requires sesame to be labeled as a major allergen, so Jack in the Box's official allergen menu should list it.
Yes. Jack in the Box allows custom orders. Removing mayonnaise eliminates the egg and soy from that component. The ketchup remains, which is typically free of major allergens. Confirm that the patties and bun do not contain egg or soy separately, as these can appear in binders or dough conditioners.
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Please verify before ordering
Allergen info changes and varies by location
Recipes, suppliers, and preparation methods change often and differ between locations, so the details here can go out of date or not match your specific Jack in the Box restaurant. Always confirm directly with the restaurant and check its official allergen menu before ordering. This page is a general research summary — it is not official information from Jack in the Box, and it is not medical advice. If you have a food allergy, decisions about what is safe to eat should be made with the restaurant and, where relevant, your healthcare provider.