For most major commercial airlines in 2026, the standard weight limit for a single checked bag in Economy Class is 50 lbs (23 kg). If you are flying in Business or First Class, this limit is often increased to 70 lbs (32 kg) per bag. It is a "high-fidelity" safety rule across the industry that almost no airline will accept a single bag weighing more than 70 lbs due to international health and safety regulations for baggage handlers; if your bag exceeds this, you will likely be required to split the contents into two separate suitcases. For domestic budget carriers, the limit can sometimes be even stricter (starting at 40 lbs for certain fare types), while international "Weight Concept" routes (common in Asia and the Middle East) allow you to check multiple bags as long as their combined weight doesn't exceed a total allowance (e.g., 30 kg). Always use a digital luggage scale before heading to the airport to avoid the stress of "overweight" fees, which can often exceed $100 per bag.