Duffel bag sizes vary based on their intended use, but they generally fall into three standard categories. Carry-on duffels typically measure around 22 x 14 x 9 inches (56 x 36 x 23 cm) to fit in overhead bins, with a capacity of 40–45 liters. Medium checked duffels usually range from 24 to 26 inches in length (approx. 60–75 liters), which is ideal for a week-long trip. Large "rolling" duffels for heavy travel can be 30 to 32 inches long (100+ liters) but must stay under the common "62 linear inches" (Length + Width + Height) limit to avoid oversized baggage fees. Soft-sided duffels are popular because they can be "squished" into tight spaces more easily than hardshell suitcases.