1. Classification Criteria for Container Ships
Container ships are divided into the following generations based on TEU capacity and vessel dimensions:
| Vessel Class | Capacity (TEU) | Length | Beam | Draft | Primary Routes |
| Small Feeder | 300–1,000 | <150 m | <25 m | <10 m | Regional short-sea |
| Panamax | 3,000–5,000 | 290 m | 32.3 m | 12 m | Trans-Pacific (old Panama Canal) |
| Post-Panamax | 5,000–8,000 | 300 m | 40 m | 13 m | Asia–Europe |
| New Panamax | 8,000–12,000 | 366 m | 48.2 m | 15 m | Asia–Europe + Trans-Pacific (new Panama Canal) |
| VLCS (Very Large Container Ship) | 12,000–15,000 | 366 m | 48–51 m | 15.5 m | Asia–Europe mainline |
| ULCS (Ultra Large Container Ship) | 18,000–24,000 | 400 m | 58–61 m | 16 m | Asia–Europe route only |
2. Detailed Breakdown of Vessel Types
Panamax — The Old Canal-Era Limit
Dimensions were constrained by the old Panama Canal lock chambers (305 m × 33.5 m), with a maximum capacity of around 5,000 TEU. This class is now being phased out gradually.
New Panamax
Following the 2016 Panama Canal expansion, the new lock chambers (426 m × 55 m) allow New Panamax vessels to carry up to 12,000 TEU. This class is currently the workhorse of both Asia–Europe and Trans-Pacific routes.
ULCS (Ultra Large Container Ship)
The world's largest container ships currently in service, with capacities exceeding 20,000 TEU and lengths approaching 400 meters. They can currently call at only a handful of deep-water ports globally (such as Shanghai Yangshan, Ningbo Zhoushan, Shenzhen Yantian, Rotterdam, etc.).
3. The World's Largest Container Ships (2025 Ranking)
Rank | Vessel Name | Shipping Line | Capacity (TEU) | Year of Maiden Voyage |
1 | MSC Irina | MSC | 24,346 | 2023 |
2 | OOCL Spain | OOCL (COSCO) | 23,992 | 2023 |
3 | HMM Algeciras | HMM | 23,964 | 2020 |
4 | Ever Alot | Evergreen | 23,992 | 2022 |
5 | CMA CGM Jacques Saade | CMA CGM | 23,112 | 2021 (LNG-powered) |
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Data Note: Vessel data sourced from Clarksons Research and publicly available information from major shipping lines. Data current as of July 2026.
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