Lightest Backpacks (25–39L): Top 20

Lightest first, out of 161 listed (outliers excluded).

1. 1. Hyperlite Mountain Gear Stuff Pack 30 — 133 g
2. 2. EXPED Cloudburst 25 — 270 g
3. 3. EXPED Summit Lite 25 — 280 g
4. 4. Trail Bum FAB — 360 g
5. 5. Karrimor mars top load 27 — 365 g
6. 6. Trail Bum FAB ALUULA — 365 g
7. 7. Trail Bum BUMMER — 370 g
8. 8. Trail Bum FAB SPECTRA — 380 g
9. 9. Montbell Versalite Pack 30 — 395 g
10. 10. Hyperlite Mountain Gear Summit 30 — 397 g
11. 11. Yamatomichi MINI — 413 g
12. 12. Yamatomichi MINI Custom Edition Size L 28-32L — 413 g
13. 13. Yamatomichi MINI Custom Edition Size M 25-30L — 413 g
14. 14. Yamatomichi MINI2 — 413 g
15. 15. Trail Bum BUMMER SPECTRA — 430 g
16. 16. Hyperlite Mountain Gear Contour 35 — 452 g
17. 17. Montbell Emergency Pack 35 — 475 g
18. 18. EXPED Summit Hike 25 — 480 g
19. 19. Montbell Storm Pack 30 — 505 g
20. 20. OMM Phantom 25 — 505 g

Compared only with other 25–39L backpacks, which still differ in use and frame design. Lighter does not mean better.