Alpha FL 40 Backpack

Regular price$350.00 CAD
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Streamlined, weather-resistant climbing pack in a light, durable Hadron LCP fabric.
Size chart


Packs Size Chart

Size Unisex (cm/in) Women's (cm/in) Men's (cm/in)
Short 42.5cm - 47.5cm (16¾" - 18¾") 40.75cm - 44.25cm (16" - 17½") 44.75cm - 48.25cm (17½" - 19")
Regular 46.5cm - 51.5cm (18¼" - 20¼") 43.25cm - 47.5cm (17" - 18¾") 47.25cm - 51.5cm (18½" - 20¼")
Tall N/A 46.5cm - 51.5cm (18¼" - 20¼") 50.5cm - 55.5cm (19¾" - 21¾")

How to find your measurements

Note: Calculate your own body measurements, then select your product size.

  1. Back Length: To determine your size, measure down the spinal column from the 7th cervical vertebra and the level of the hip iliac crest.
  2. Shoulder strap: Sizing refers to bust/chest circumference. Measure around the bust/chest at the fullest point.
  3. Hipbelt: Sizing is based on a measurement around the hip iliac crest. Measure around the body at the top edge of the hip iliac crest, approximately 2 inches below the point at which you would measure your waist.
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With a minimalist, disciplined design hardwired for fast and light alpine travel, the Alpha FL 40 Backpack is built to climb. Made from our proprietary 315d Hadron AC² LCP grid fabric, it delivers unrivaled abrasion resistance for its weight, and the streamlined profile allows freedom of movement while climbing rock and ice. Intuitive – and glove-friendly – a pull-to-open/pull-to-close system makes access quick and easy. A top strap secures a rope, six lash points and an integrated bungee system provide external carry options, and an embedded RECCO reflector can aid search in rescue situations.

Technical Features

  • Weather resistant
  • Durable

Pack Attachment Configuration

  • Two ice axe loops
  • Six integrated front lash points
  • Compression system can carry crampons, ice tools or a belay parka

Pack Compression Strap Configuration

  • Top compression strap

Pack Design & Construction

  • Arc'teryx AC² (Advanced Composite Construction) technology system is seam taped and highly water resistant
  • Rigid, formed backpanel provides support and structure while remaining comfortable against the back
  • Ultralight design and construction with full climbing functionality
  • 315d Hadron AC² nylon with Hadron is light, ultradurable, and waterproof

Pack Dimensions

  • Alpha FL 40 Backpack = Height: 63cm, Width: 30cm, Depth: 25cm

Pack Loading & Closure Configuration

  • RollTop closure
  • Large, webbing pull-tabs for quick and easy, glove-friendly access
  • Pull-to-open / pull-to-close drawcord main compartment for easy access

Pack Pocket Configuration

  • Internal security pocket
  • External WaterTight zippered pocket with key clip

Pack Suspension Configuration

  • Thermoformed shoulder straps
  • Adjustable, removable sternum strap
  • 4 cm/ 1.6 in webbing hipbelt


  • French Regulation: AGEC Law - Article 13
  • Origin of fabric: TAIWAN
  • Origin of dying: TAIWAN
  • May release plastic microfibres into the environment when washing

Climb On Equipment offers free in-store pick up and ships within Canada & USA (some restrictions apply).

Most orders qualify for free shipping when over $99. Heavy/bulky items such as bouldering pads and faster shipping options do not qualify for free shipping. 

Work & Rescue Orders may qualify for volume discounts. Volume discount orders do not qualify for free shipping. For a more detailed information on shipping, please go to our Shipping Policy page or learn about Returns and Warranty.


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