| F Flute | 0.8-1.0 | Ultra-thin, fine profile | Premium folding cartons, cosmetics, electronics |
| E Flute | 1.0-1.5 | Thin profile, good printability | Retail packaging, printed cartons |
| B Flute | 2.5-3.0 | Good cushioning | Shipping boxes, general packaging |
| C Flute | 3.5-4.0 | Good cushioning and stacking strength | Shipping cartons, e-commerce boxes |
| A Flute | 4.5-5.0 | Thick, high cushioning | Heavy-duty packaging, industrial use |
| EE Flute | 1.4-2.0 | Double E, thin and strong | Premium packaging, high-quality printing |
| EB Flute | 2.2-3.0 | E + B, strong with printability | Retail transportation, display packaging |
| EC Flute | 3.4-4.0 | E + C, balanced strength | E-commerce, medium heavy-duty boxes |
| BC Flute | 5.5-6.5 | B + C, extra strong | Heavy items, industrial shipping boxes |
| AB Flute | 6.5-7.5 | A + B, very high cushioning | Large loads, machinery, appliances |
| AC Flute | 7.5-8.5 | A + C, high compression strength | Industrial packaging, palletized goods |
| AA Flute | 9.0-10.0 | Double A, maximum cushioning | Extra heavy-duty, export packaging |