measuring

• https://www.cabinzero.com/pages/how-to-find-right-size-for-backpack

aer

• Pro Pack Slim
  • 12.5L
  • 860g
  • 43 x 30.5 x 10cm

bellroy

• Classic Backpack
  • 20L
  • 750g
  • 43 × 35 × 15cm

crumpler

• fog
  • 24L
  • 950g
  • 48 x 31.5 x 20.5cm
• entity
  • 25L
  • 1.3kg
  • 49 x 34 x 20.5cm

ctactical

• CT15 V3.0 Backpack - PATCHAHOLIC WBP N420D RS
  • 15L
  • 1.2kg
  • 48 x 29 x 16.5cm
• CT21 V3.0 Backpack - PATCHAHOLIC WBP N420D RS
  • 21L
  • 1.2kg
  • 48 x 34 x 18cm

tomtoc

• UrbanEX-T65 Laptop Backpack M
  • 30L
  • 1.5kg
  • 18.90" × 13.39" × 8.27"
  • sidenote why are they mixing imperial and metric measurements lmfao