Convoy S21E vs Streamlight ProTac 2L-X USB size comparison
The Streamlight ProTac 2L-X USB is 14.2 mm (0.56 in) longer than the Convoy S21E, with about the same max diameter/width. Weights are published on different bases (with battery vs without battery), so compare them with care.
The Streamlight ProTac 2L-X USB is 14.2 mm (0.56 in) longer than the Convoy S21E, with about the same max diameter/width. Weights are published on different bases (with battery vs without battery), so compare them with care.
Dimensions
| Convoy S21E Check price ↗ | Streamlight ProTac 2L-X USB Check price ↗ | |
| Length | 116.4 mm (4.58 in) | 130.6 mm (5.14 in)+14.2 mm |
| Head / width | 27.3 mm (1.07 in) | 26.9 mm (1.06 in)−0.4 mm |
| Body | 27.3 mm (1.07 in) | 23.9 mm (0.94 in)−3.4 mm |
| Weight | 88 g without battery | 125 g with battery |
| Battery | 21700 | 18650 / 2x CR123A |
| Max output | — | 500 lm |
| Throw | — | — |
| Type | EDC | EDC |
| Price | from $27.99 at flashlightgo.com, as of Nov 4, 2026 | $83.05 at batteryjunction.com, as of Nov 4, 2026 |
| Source | flashlightgo.com sourced Output depends on LED option | batteryjunction.com sourced |
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S21E vs ProTac 2L-X USB: how they differ
Size and weight
The Convoy S21E is the shorter light: 116.4 mm (4.58 in) against 130.6 mm (5.14 in), a difference of 14.2 mm (11%). At their widest points they are about the same (27.3 vs 26.9 mm). Weights are published on different bases (Convoy S21E: 88 g without battery; Streamlight ProTac 2L-X USB: 125 g with battery), so they are not directly comparable.
Brightness and throw
The Streamlight ProTac 2L-X USB is rated at 500 lm; we have no published maximum for the Convoy S21E. Output for the Convoy S21E depends on the LED option chosen.
Battery
The Convoy S21E runs on a removable 21700 battery; the Streamlight ProTac 2L-X USB runs on removable 18650 / 2x CR123A batteries. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Price
When we checked on Nov 4, 2026, the Convoy S21E was from $27.99 at flashlightgo.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Convoy S21E cost $55.06 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 Convoy S21E if you want a shorter light (14.2 mm shorter). On the specs we track, the Convoy S21E is ahead or level everywhere; the Streamlight ProTac 2L-X USB 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 S21E Check price ↗ Streamlight ProTac 2L-X USB
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
S21E vs ProTac 2L-X USB FAQ
Which is smaller, the Convoy S21E or the Streamlight ProTac 2L-X USB?
The Convoy S21E is the shorter light: 116.4 mm (4.58 in) against 130.6 mm (5.14 in), a difference of 14.2 mm (11%). At their widest points they are about the same (27.3 vs 26.9 mm). Weights are published on different bases (Convoy S21E: 88 g without battery; Streamlight ProTac 2L-X USB: 125 g with battery), so they are not directly comparable.
Which is cheaper, the Convoy S21E or the Streamlight ProTac 2L-X USB?
When we checked on Nov 4, 2026, the Convoy S21E was from $27.99 at flashlightgo.com and the Streamlight ProTac 2L-X USB $83.05 at batteryjunction.com, so the Convoy S21E cost $55.06 less. Prices change often, so check the current price before you buy.
Do the Convoy S21E and Streamlight ProTac 2L-X USB use the same battery?
The Convoy S21E runs on a removable 21700 battery; the Streamlight ProTac 2L-X USB runs on removable 18650 / 2x CR123A batteries. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Compare Convoy S21E with similar lights
Compare Streamlight ProTac 2L-X USB with similar lights
More
Sources
- Convoy S21E: specs from manufacturer published specs as listed by flashlightgo.com. Drawing: outline from published specs. Price from $27.99 from flashlightgo.com, checked Nov 4, 2026; prices change often.
- Streamlight ProTac 2L-X USB: specs from manufacturer published specs as listed by batteryjunction.com. Drawing: outline from published specs. Price $83.05 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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