Datrex 3600 review: no-cook, no-water calories for the go-bag and the car

This is a research-based review, based on manufacturer specs and published data. We do not test products. Specs, ingredients and certifications come from Datrex's product page for the DX3600F ration, checked November 1, 2026. Water and calorie references come from Ready.gov and the FDA.

Most emergency food assumes you can boil water. In the first hours of an outage, or in a car on an evacuation route, you often cannot. That is the job a ration bar does. Datrex makes its bars to the standard used for lifeboat and life-raft survival kits: compact, sealed against air and moisture, and edible straight from the wrapper.

Each DX3600F package holds 18 individually wrapped bars of 200 calories, for 3,600 calories in a block that weighs 24.8 oz and is about the size of a paperback. The maker says the bars are non-thirst-provoking, which matters when water is rationed. The question is how far 3,600 calories goes. At the FDA's 2,000-calorie daily reference, it is 1.8 days for one adult, by our arithmetic.

Who should buy it

• Anyone building a go-bag or car kit that has to sit untouched for years and work with no stove.
• Households that want a no-cook backup for the first day of an outage, before a camp stove is set up outdoors.
• Workplaces and schools that keep shelter-in-place supplies, where cooking is not an option.
• Vegans: Datrex lists the bars as vegan, non-GMO and made without preservatives.

Who should skip it

• Anyone with a wheat or gluten allergy. The bars are made from wheat and malted barley flour.
• Households wanting their main outage food supply. Bars are dense calories, not meals, and the 5-year shelf life is short next to freeze-dried food.
• People managing diabetes or blood sugar should ask their doctor first. The bars are flour, fat and sugar, and the maker's page gives no fiber or protein figures.

Strengths

• Zero preparation. No cooking, no water and no tools. Datrex says the bars can be eaten solid or mixed with water.
• Compact and light. 3,600 calories in 24.8 oz, about 145 calories per ounce by our arithmetic, in a 3.5 × 2.5 × 4.5 in package.
• Pre-portioned. Eighteen wrapped 200-calorie bars make rationing simple: three bars at a time gives a 600-calorie meal.
• Built to a marine standard. The maker states the DX3600F meets U.S. Coast Guard requirements under ISO 18813:2006, the survival-ration standard for lifeboats.
• Sealed packaging. Vacuum-bagged in a polymer-foil pack, which suits a trunk or a closet better than loose snacks.

Drawbacks

• Short shelf life for emergency food. 5 years from manufacture, against 25 to 30 years claimed for many freeze-dried buckets.
• Not a full diet. It covers energy for a short period. It is not meant to replace balanced meals for weeks.
• Allergens. Contains wheat and barley. The page says it is free of peanut products but gives no full allergen statement.
• One flavor. Coconut-flavored shortbread for every meal. Morale matters in a long outage.
• Water still matters. Not needing water to eat is not the same as not needing water. Every person still needs drinking water.

How it compares

No-cook bars and freeze-dried kits solve different problems. Figures are from each maker's page; person-days are our arithmetic at the FDA's 2,000-calorie reference.

Using it in a long outage

Where a ration bar fits in an outage plan

In a power outage at home, eat in order: refrigerated food first, then the freezer, then the pantry. Ration bars come last, or they live in places where nothing else works: a go-bag, a glovebox, a desk drawer. Our guide to the best food for a power outage covers the pantry layer, and the long-term food storage guide covers buckets for longer events.

Calories per day: how long one pack lasts

• One adult at 2,000 calories a day: 1.8 days per package.
• One adult rationing at 1,200 calories a day (six bars): 3 days per package. That is a short-term survival level, not a diet to keep up for weeks.
• A family of four at 2,000 calories each: 8,000 calories a day, or more than two packages daily.
• Children, older adults and people with medical conditions have different needs; plan with real meals wherever possible.

These figures are our arithmetic from the maker's 3,600-calorie label. The practical takeaway: one package per person per kit is a 24- to 72-hour bridge. For a household plan, pair bars with freeze-dried meals and canned food.

Water and storage

Ready.gov says to store at least one gallon of water per person per day for several days. The bars need none for preparation, which is why they suit water-limited kits, but each person still needs that drinking water. Store packages in a cool, dry place: the USDA says shelf-stable food keeps best below 85°F. A car in summer runs far hotter than that, so check and rotate car-kit bars well before the 5-year date printed on the pack.