Why compare these options?

For a small daypack shortlist, compare the Airox 18L with Speed Lite 21L: the capacity difference is 3L and both have recorded outer measurements. Rab empty weight is unknown, so the Deuter listing of 470g cannot establish which pack is lighter.

  • Does your planned day load need the extra published 3L, from 18L to 21L?
  • What can the recorded outer measurements tell you about scale before Rab's dimension-axis order and actual packed fit are checked?
  • Can you defer the weight comparison until the Airox empty weight is sourced, while keeping strap fit and loaded access as untested items?
Rab Airox 18L Day Pack — manufacturer galleryRab Airox 18L Day PackQAQ-09-MUL-MEDDeuter Speed Lite 21 — manufacturer galleryDeuter Speed Lite 214046051170138 / linden-cactus

Manufacturer model photographs; pictured colour and size are not independently confirmed. No hands-on winner or rating is assigned.

FieldRab Airox 18L Day PackDeuter Speed Lite 21
Published empty weightWeight unknown470 g
Outside dimensions50 × 29 × 23 cm · Axis names not published46 × 28 × 18 cm · length / width / depth
Published capacity18 L21 L
Shoulder strapUnknownUnknown
Pockets / storagePocket layout and usable openings are unknownPocket layout and usable openings are unknown
Recorded priceUSD 165.00 · Rab United States official selected variant offerEUR 80.00 · Deuter /de-en/ (EUR)
Specification optionQAQ-09-MUL-MED4046051170138 / linden-cactus

What changes between the published specifications

Listed capacity: 18 L versus 21 L. Volume ratings do not establish a pocket opening or the shape of an object that can fit.

Outside dimensions stay in the order used by each manufacturer. Match labelled axes where supplied; unlabelled axes do not support a height-to-height claim.

Questions these numbers cannot settle

  • Will your phone and passport fit together with the bag fully closed?
  • Can you reach the needed pocket while wearing the bag?
  • Does the strap adjust comfortably over your clothing and body measurements?
  • How does the particular material perform in your use?

Use the two fact sheets for model details, then check those questions with the actual bag or directly with its manufacturer.

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Official sources