Convoy M21B vs Sofirn SC33 size comparison
The Sofirn SC33 is 10.5 mm (0.41 in) shorter than the Convoy M21B, and 3.7 mm narrower at its widest point. Weights are published on different bases (without battery vs listed), so compare them with care.
The Sofirn SC33 is 10.5 mm (0.41 in) shorter than the Convoy M21B, and 3.7 mm narrower at its widest point. Weights are published on different bases (without battery vs listed), so compare them with care.
Dimensions
| Convoy M21B Check price ↗ | Sofirn SC33 Check price ↗ | |
| Length | 141.5 mm (5.57 in) | 131 mm (5.16 in)−10.5 mm |
| Head / width | 35.7 mm (1.41 in) | 32 mm (1.26 in)−3.7 mm |
| Body | 27.1 mm (1.07 in) | — |
| Weight | 120 g listed | 110 g without battery |
| Battery | 21700 | 21700 |
| Max output | — | 5,200 lm |
| Throw | — | — |
| Type | EDC | EDC |
| Price | $48.99 at flashlightgo.com, as of Nov 4, 2026 | from $41.99 at flashlightgo.com, as of Nov 4, 2026 |
| Source | flashlightgo.com sourced Output depends on LED option | flashlightgo.com sourced Only head diameter listed |
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M21B vs SC33: how they differ
Size and weight
The Sofirn SC33 is the shorter light: 131 mm (5.16 in) against 141.5 mm (5.57 in), a difference of 10.5 mm (7%). At its widest point the Sofirn SC33 is 3.7 mm slimmer (32 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; Sofirn SC33: 110 g without battery), so they are not directly comparable.
Brightness and throw
The Sofirn SC33 is rated at 5,200 lm; we have no published maximum for the Convoy M21B. Output for the Convoy M21B depends on the LED option chosen.
Battery
Both run on a removable 21700 battery, so spare cells work in either light.
Price
When we checked on Nov 4, 2026, the Convoy M21B was $48.99 at flashlightgo.com and the Sofirn SC33 from $41.99 at flashlightgo.com, so the Sofirn SC33 cost $7.00 less. Prices change often, so check the current price before you buy.
Type
Both are EDC lights in our catalog with a tube body.
Which should you buy?
Choose the Sofirn SC33 if you want a shorter light (10.5 mm shorter) and a slimmer profile (3.7 mm narrower). On the specs we track, the Sofirn SC33 is ahead or level everywhere; the Convoy M21B makes sense mainly if its price, interface or a feature we don't track suits you better. We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Convoy M21B Check price ↗ Sofirn SC33
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M21B vs SC33 FAQ
Which is smaller, the Convoy M21B or the Sofirn SC33?
The Sofirn SC33 is the shorter light: 131 mm (5.16 in) against 141.5 mm (5.57 in), a difference of 10.5 mm (7%). At its widest point the Sofirn SC33 is 3.7 mm slimmer (32 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; Sofirn SC33: 110 g without battery), so they are not directly comparable.
Which is cheaper, the Convoy M21B or the Sofirn SC33?
When we checked on Nov 4, 2026, the Convoy M21B was $48.99 at flashlightgo.com and the Sofirn SC33 from $41.99 at flashlightgo.com, so the Sofirn SC33 cost $7.00 less. Prices change often, so check the current price before you buy.
Do the Convoy M21B and Sofirn SC33 use the same battery?
Both run on a removable 21700 battery, so spare cells work in either light.
Compare Convoy M21B with similar lights
Compare Sofirn SC33 with similar lights
More
Sources
- Convoy M21B: specs from manufacturer published specs as listed by flashlightgo.com. Price $48.99 from flashlightgo.com, checked Nov 4, 2026; prices change often.
- Sofirn SC33: specs from manufacturer published specs as listed by flashlightgo.com. Price from $41.99 from flashlightgo.com, checked Nov 4, 2026; prices change often.
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