Main body: X-Pac VX21 — 3 layer fabric: 210 denier nylon face fabric with polyester reinforcement grid, laminated to a waterproof PET barrier and 50 denier inner polyester backing

Side pockets, straps, and hipbelt: 210D HDPE Gridstop — 210 denier nylon with a gridstop pattern comprised of high-strength HDPE fibers

Front pocket: Heavy duty mesh — comprised of a nylon and lycra blend

Bottom and back panel: X-Pac X42 — 2 layer fabric: robust 420 denier face fabric with polyester reinforcement grid. laminated to a waterproof PET barrier

Frame system: Two removable aluminum stays with a layer of 1/4” foam padding sewn-in along the back panel

*The X-Pac fabrics we use are waterproof up to 200 psi, however due to small holes at seam locations, we recommend using a pack liner to ensure your gear stays dry in the event of heavy rain. A simple and effective pack liner is included with purchase of the Sundown.

Standard weight

Small: 1.58 lbs | 25.3 oz | 717 grams

Medium: 1.64 lbs | 26.2 oz | 742 grams

Large: 1.69 lbs | 27.1 oz | 767 grams

Tall: 1.76 lbs | 28.2 oz | 799 grams

*Approximate weight of a single top compression strap backpack with a size medium hipbelt. Please note that actual pack weights will vary depending on sizing and accessories.

Frameless weight (without frame and hipbelt)

Small: 1.13 lbs | 18.1 oz | 513 grams

Medium: 1.16 lbs | 18.6 oz | 526 grams

Large: 1.18 lbs | 19.0 oz | 537 grams

Tall: 1.23 lbs | 19.6 oz | 556 grams

Total approximate capacity: 48 Liters

Main compartment: 38 Liters (able to fit most bear canisters)

Side pockets: 5 Liters (2.5L per side)

Front mesh: 5 Liters

Pack circumference: 34.5” in the main body, with a slight increasing taper towards the top

Pack height: 33” unrolled, 28” closed (at full capacity)

Width of back panel: 11” wide

Depth of main compartment: approximately 8” wide

The maximum load we recommend carrying is approximately 30-32 pounds. This rating based on comfort, and can vary depending on body build.

Here is an in-depth sizing video with instructions for taking your required measurements. See below for sizing charts.

Torso Sizing

Pack sizing is based on torso length and not height. If you are in between sizes, we recommend sizing up.

Small: 14.5"-17"

Medium: 17"-19.5"

Large: 19.5"-22"

Tall: 22"-24.5"

Hipbelt Sizing

Hipbelt sizes are based on waist measurements. Measure your waist where it is most narrow, above your hips, or wherever you would like your hipbelt to sit. We recommend erring on the larger size when choosing a belt, so more padding will wrap around your waist. However, make sure your waist measurement is no smaller than the minimum circumference listed. If you think you may be losing weight (a potential occurrence during long distance hiking), then make sure you factor this into your decision and consider erring on the smaller side.

X-Small: recommended for waists between 25"-28.75" (length of padded portion: 22.75”; adjustable range 25”-35”)

Small: recommended for waists between 28.75"-31.75" (length of padded portion: 25.75”; adjustable range 28”-38”)

Medium: recommended for waists between 31.75"-34.75" (length of padded portion: 28.75”; adjustable range 31”-41”)

Large: recommended for waists between 34.75"-37.75" (length of padded portion: 31.75”; adjustable range 34”-44”)

X-Large: recommended for waists between 37.75"-47" (length of padded portion: 34.75”; adjustable range 37”-47”)