Spring Japan Baggage Rules: Separate 9C from IJ

The biggest mistake when checking “Spring Airlines Japan baggage” is not miscounting a kilogram. It is treating two operating airlines as though they had one policy:

• Spring Airlines (9C) is the China-based carrier operating multiple China–Japan routes.
• Spring Japan (IJ) is a Japan-based carrier with different fare products and cabin dimensions.

The Spring name, aircraft colour or booking-site logo does not decide the allowance. Check the flight number and the carrier shown after operated by on every sector. A connecting itinerary can apply more than one policy.

Rules checked: 13 July 2026. The operating carrier, fare product, sale date and exact flight determine the allowance. The checkout page, e-ticket and current carrier notice control if they differ from this guide.

Identify the rule set first

The 9C cabin dimensions come from Spring Airlines’ current general conditions. The IJ figures come from Spring Japan’s current international baggage page. (Spring Airlines conditions, Spring Japan international baggage rules)

Spring Airlines 9C: check the product and sale date

“Seven kilograms in the cabin” is not the only 9C configuration. The current conditions generally assign one 7 kg, 20 × 30 × 40 cm cabin item to basic products. Some higher products allow one 10 kg item measuring up to 20 × 40 × 55 cm. Exceeding weight, size or number of items can move a bag into the checked-baggage process and create a charge.

Checked allowance cannot be reduced to a timeless chart. Spring Airlines adjusted products from 29 March 2026. Its current Super Saver product has no free checked allowance, while the Premium product includes 20 kg; other products must be read from the specific booking. A passenger with an older ticket should use the purchased product and e-ticket rather than today’s product names. (Spring Airlines 2026 product notice)

Before payment:

1. record the complete fare-product name rather than “sale fare”;
2. capture the checkout screen showing cabin and checked allowance;
3. check each passenger separately instead of assuming weights can be pooled.

Spring Japan IJ: 0 / 20 / 30 kg across three products

IJ currently sells Lucky Spring, Spring and Spring Plus on international routes. Their free checked allowances are 0, 20 and 30 kg respectively. Cabin baggage remains a combined 7 kg for all three, so a higher fare product does not automatically increase cabin weight.

If a checked bag is certain, compare the final price of “ticket + required baggage + required seat or service” with the next fare product. A bundled product can be clearer on one trip; a lower fare plus prepaid baggage may be lower on another. The live order page, not a fixed rule of thumb, answers that question.

IJ states that it does not accept pets. Assistance dogs follow separate provisions and must not be inferred from the ordinary-pet policy. If an animal is part of the trip, work through the international pet-flight decision guide and obtain written acceptance from every operating carrier.

Infants, children and folding strollers

IJ currently allows one stroller, child safety seat or bassinet to be checked free for each infant or child. That single free item does not add to an adult’s baggage allowance and does not guarantee that an oversized item can be handed over at the gate. Packaging, drop-off and collection remain subject to airport instructions.

For 9C, confirm child items, child tickets and baggage in the exact booking. Do not import IJ’s free-item rule into a 9C ticket, and do not assume an infant ticket carries the same checked allowance as an adult. Family travellers can continue with the China infant-ticket checklist and Air China child-fare guide.

Power banks, lithium batteries and smart bags

Power banks and spare lithium batteries belong in cabin baggage, not checked baggage. Protect them against short circuit and keep the capacity marking legible. Since 28 June 2025, the Civil Aviation Administration of China has prohibited power banks without a valid 3C mark, with an illegible mark, or from a recalled batch or model on domestic flights in China. An international itinerary can also face rules from the origin airport, transfer screening and operating carrier. (CAAC power-bank notice)

A smart bag with a non-removable battery may be rejected as checked baggage. A removable battery will normally need to be removed and carried in the cabin. Inspect the mechanism before arriving at the counter.

Connections and codeshares: calculate sector by sector

For an itinerary combining 9C and IJ, Spring and another airline, or separate tickets, answer each question for every flight:

• Who is the operating carrier?
• Which sector has the smallest cabin limit?
• Is checked baggage through-tagged, or must it be collected after entering Japan and checked again?
• On separate tickets, who bears the risk if the first delay causes the second flight to be missed?
• Does a new security screening change battery or liquid handling?

Pack to the strictest cabin limit across the itinerary. For a self-transfer, allow time for baggage collection, immigration, terminal movement and a new check-in. The ticket saving may not cover a missed onward flight.

Decide when to buy baggage

Measure before purchasing:

1. weigh all bags that will enter the cabin together;
2. measure the packed exterior, including wheels, handles and side pockets;
3. match the e-ticket’s operating carrier and fare product;
4. compare prepaid baggage with the next fare product in the carrier’s order manager;
5. save the receipt and recheck the operating carrier before departure.

Do not plan around “they probably will not weigh it,” “a backpack never counts,” or a fixed airport price. Enforcement and fees vary by airport, flight and channel. For a more general packing method, use the budget-airline carry-on guide.

Pre-ticket decision checklist

• Every flight number and operating carrier is confirmed.
• The exact 9C or IJ fare product is recorded.
• Number, weight and size of cabin items meet the strictest sector.
• Free checked allowance appears in the order or e-ticket rather than being assumed.
• Strollers, child seats, sports gear and other special items are confirmed separately.
• Power-bank capacity is legible; any China domestic sector also meets the 3C rule.
• A self-transfer includes time for collection, entry and recheck.
• Baggage receipts and policy captures are available offline.

If the flight is not chosen yet, compare dates, operating carriers, transfer type and the total with required baggage. Then verify the final rules on the carrier’s checkout page.

✈️ Compare candidate China–Japan flights. Search results identify possible itineraries; they do not confirm baggage. Verify the operating carrier and purchased product before payment. This may be an affiliate link; the price does not increase, and we may earn a commission.