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The Brain

Regular price $59.00 Sale price $17.70
70% OFF
Color: Black

Color

Size Guide

Backpack Sizing Chart

Pack size is based on two measurements: torso length and waist (hip belt) circumference.

How to Measure

Waist: Measure around your waist just above the top of the hip bones, roughly two fingers below the belly button.

Torso: Measure from the bony bump at the base of the neck (C7 vertebra) down the spine to the point behind your belly button.

Men's / Unisex Framed Packs

Pack Size Torso (in) Torso (cm) Waist Belt (in) Waist Belt (cm)
XS 13 – 18 33 – 46 26 – 32 66 – 81
S 15 – 20 38 – 51 26 – 32 66 – 81
M 15 – 20 38 – 51 31 – 36 79 – 92
L 17 – 24 43 – 61 35 – 40 89 – 102
XL 17 – 24 43 – 61 39+ 100+

Women's-Specific Packs

Pack Size Torso (in) Torso (cm) Waist Belt (in) Waist Belt (cm)
XS 13 – 18 33 – 46 26 – 32 66 – 81
S 13 – 18 33 – 46 31 – 36 79 – 92
M 16 – 22 41 – 56 35 – 40 89 – 102
L 16 – 22 41 – 56 39+ 100+

Notes: Pack capacity does not change between sizes — only the yoke and waist belt differ. If you fall between waist belt sizes, we recommend sizing down so the belt can snugly secure around your hips. The listed ranges leave a little extra adjustment room for extra clothing layers.

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The Brain

The Brain

Smart storage for the essentials that keep you moving.

Known as the “BRAIN” of our packs, this versatile lid adds essential storage and functionality to your wildland fire gear. Designed to keep critical items organized and within reach, it offers space for batteries, headlamps, snacks, flagging, fiber tape, and other small necessities you need on the line. An admin pocket provides room for notebooks, maps, and IAPs, for quick access. Equipped with Quick Attach buckles, it’s plug-and-play compatible with HOT SPEED and SHIFT systems, and serves as a replacement lid for HOTSHOT CF and HOTSHOT packs. Rugged and adaptable, it can even double as a minimal medical kit—because versatility matters when every second counts.

  • Admin pocket for notebooks, maps, and IAPs
  • Quick Attach buckles included to plug-and-play with HOT SPEED and SHIFT compatibility
  • Replacement part for HOTSHOT CF and HOTSHOT
  • Works as minimal medical kit