50L · Thru-hiking backpack
Swift
Price
$375
A modern take on our time-tested Swift, in a choice of fabrics from ultralight to budget-friendly. It configures into the right pack for anything from an overnight to a calendar-year Triple Crown.
- Standard configuration
- From 35.6 oz
- Total volume
- 56 L
- Harness styles
- 3
Choose material & color
Material / color — VX21 Black
VX21 A proven 4 layer waterproof laminate with a 210D nylon face that balances durability and structure, but it's the heaviest of our pack fabrics.
LS21 A waterproof laminate with a resin coated non-woven face that's built for abrasion resistance, tougher than Robic Nylon and lighter than VX21.
Ultra 200X Among the lightest of our pack fabrics and by far the most abrasion resistant, with a waterproof laminate that handles about twice the wear of 500D Cordura.
Robic Nylon A soft, flexible and light ripstop nylon, but its coating is water resistant rather than waterproof and it isn't as tough as the laminated fabrics.
Choose your harness style
Size your harness
Torso adjusts from 16–22″. Style is about shape; size is about measurements.
Complete your kit
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Pack Liner $20
Recognized by
Standard configuration
From 35.6 oz — 1,010 g Ultralight Backpack
Best for
- Thru-hiking
- Bushwhacking and off-trail travel
- Triple Crown trails and long-distance routes
Comfort is personal
Choose how it carries.
Every harness fits the same pack body. Pick the shape that suits your build, then size it to your torso.

Vest
More storage up front
- Six points of suspension between the pack and you
- Eliminates sway and bounce when walking or running
- Transfers some of the load to your core
- Helps prevent sores on your shoulders and hips
- Helps reduce back pain after long days on trail
- Extra storage pockets and quick-access options

Shoulder
A familiar, open feel
- Traditional backpack shoulder straps
- Two 4-way stretch pockets that hold 500 ml soft bottles
- Sliding sternum strap
- Covers less of your torso
- Weighs about 2 oz less than the Vest Harness

S-Curve
Curves around your chest
- Designed for narrow shoulders and a larger chest
- Two 4-way stretch pockets that hold 500 ml soft bottles
- Sliding sternum strap
- Avoids covering the chest, for more comfort
- Weighs about 2 oz less than the Vest Harness
Sizing
The right fit, from mile one.
Have a friend measure while you stand straight. Tilt your head forward to find C7 (the bony bump at the base of your neck). Put your hands on your hips with thumbs pointing back, slide up to the top of the hip bones, and measure along your spine from C7 to the line between your thumbs. For the belt, measure around your hips at that same height, which sits a little above your pant waist.
Torso adjusts from 16–22″. Style is about shape; size is about measurements.
Harness by torso length
- Small
- 14–17″
- Large
- 17–22″
Between sizes? Talk to us first.
Hip belt by waist
- Small
- 26–29″
- Medium
- 30–35″
- Large
- 36–50″
Between sizes? Choose the smaller.
Suspension
Carry it framed or frameless.
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With the Delrin hoop stay
The stay carries more of the weight on your hips.
- Transfers load to the hip belt
- Makes carrying heavy loads more comfortable
- Reduces pack snag
- Increases load-carrying capacity by about 10 lb / 4.5 kg
- Recommended base weight
- 12 lb / 5.5 kg
- Maximum load
- 35 lb / 15.8 kg
-
Frameless
Remove the stay to save weight.
- Decreases pack weight by 3 oz / 85 g
- Great for fastpacking or super ultralight backpacking
- Recommended base weight
- 8 lb / 3.5 kg
- Maximum load
- 25 lb / 11 kg
Every ounce accounted for
What's built in.
- Adjustable torso length
- Three harness stylesShoulder Harness, S-Curve or Vest Harness.
- Three exterior woven pocketsSo you only have to unload your pack when it's time to set up camp.
- Rear pocket
- Two side pockets
- Breathable, durable 4-way stretch material
- Large shoulder strap pocketsKeep things close at hand.
- Removable hip belt
- Minimal-contact back panel
- Top loading with dry bag closure
- Internal zippered stash pocketFor your wallet and other small necessities.
- Multiple-point cord compressionKeeps your load stable, whatever its size.
- Single ice axe or trekking pole attachment point
- Two layers of materialAt key points, to strengthen the pack and prevent holes.
- Dual hydration ports
- Removable hydration bladder
- Sliding sternum strapsOn the Vest and Shoulder harnesses.
- Delrin hoop stayFor added support on heavy-load days.
See it in the field
Swift Ultralight Backpack
Specifications
The details make the difference.
Standard configuration: body, Delrin stay, large shoulder harness and medium hip belt. Your material, harness and belt change the final weight.
General
- Suspension
- Flight Series
- Torso range
- 16″–22″38–56 cm
- Dimensions (W × D × H)
- 11″ × 7″ × 22″28 × 18 × 56 cm
- Colors
- Blue, Black, Coyote Brown (VX21); Gray (LS21); Black (Ultra 200X); Gray, Green (Robic)
- Maximum load
- 35 lb16 kg
- Minimum load
- 15 lb6.8 kg
- Delrin stay load boost
- About 10 lbAbout 4.5 kg
- Uses
- Lightweight and long-distance backpacking
Materials
- Pack body
- LiteSkin LS21, X-Pac VX21, Ultra 200X or Robic nylon
- Body contact
- 3D mesh
- Pockets
- Challenge Sailcloth Ultra Stretch
Volume
- Body
- 41 L (2,502 in³)41 L
- Extension collar
- 10 L (610 in³)10 L
- Exterior pockets
- 5 L (305 in³)5 L
- Total volume
- 56 L (3,417 in³)56 L
Weight
- Body, X-Pac VX21
- 22.3 oz630 g
- Body, LiteSkin LS21
- 22.6 oz640 g
- Body, Robic
- 18.7 oz530 g
- Delrin stay
- 1.8 oz51 g
- Large shoulder harness
- 7.2 oz204 g
- Medium hip belt
- 7.9 oz225 g
- Standard configuration, VX21
- 39.2 oz1,110 g
- Standard configuration, LS21
- 39.5 oz1,120 g
- Standard configuration, Robic
- 35.6 oz1,010 g
- With large Vest Harness, VX21
- 40.9 oz1,160 g
- With large Vest Harness, Robic
- 37.3 oz1,055 g
- Frameless, no hip belt, VX21
- 29.5 oz835 g
- Frameless, no hip belt, Robic
- 25.9 oz735 g
Before you head out
Good questions. Clear answers.
Still deciding? Ask a real gear person (opens in a new tab)
Which harness should I choose?
How do I find my size?
How much can I carry?
Is the Swift waterproof?
Why does the weight vary?
From the people who carry it









