Six Moon Designs Swift X Review

Overview

The Swift X is Six Moon Designs’ roll-top, framed thru-hiking pack, a modernized update of the company’s original Swift and a member of its premium Zero-G line. It’s built around an adjustable torso and a menu of harness and hip belt options, so a hiker can tune it to their body and their base weight. The trade-off is plain: it isn’t the lightest framed pack in the cottage-gear world, but it carries better than most of the ones that are.

Key Specs

Spec	Detail
Weight	765–1,151 g depending on configuration (about 1,100 g / 38.8 oz in the standard framed setup with vest harness)
Volume	50 L (roughly 41 L main body plus extension collar), up to 56 L with exterior pockets
Torso length	16–22 in, adjustable
Frame	Removable Delrin hoop stay
Body fabric	X-Pac VX21 or Liteskin LS21
Pockets	UltraStretch mesh; one front, two side, plus hip and vest pockets depending on harness
Closure	Roll-top with buckle and Y-strap
Hip belt sizing	Small 26–29 in, Medium 30–35 in, Large 36–50 in (waist)
Recommended load	About 25 lb frameless, up to 35 lb with the stay
Price	From $350; $375 for the standard listing

Performance

Carry and suspension. The Swift X’s reputation rests on how it moves weight. Reviewers at The Trek found the hoop stay does what it should in a pack this light, shifting load from the shoulders to the hips. Treeline Review concluded that, for a weight penalty of a candy bar or two, the Swift X has a better suspension system and more robust features than the lighter Gossamer Gear Mariposa, Hyperlite 3400 Southwest and Zpacks Arc Haul. The limit shows up at the top of the load range. Gear Junkie’s tester found the hip belt can’t quite stay comfortable with heavier loads, though it handled weekend-length trips well. Owners hauling a week of food and a bear canister should treat the 35-lb recommendation as a ceiling, not a target.

The vest harness. The headline option is the Flight vest harness, which borrows from trail-running vests: wide, low-profile straps with pockets built in. Gear Junkie counted six pockets on the vest alone, and The Trek’s reviewer went as far as calling it the pack’s best feature and suggested that choosing standard straps would probably be a mistake. Traditional shoulder straps and S-curve straps are also offered, and SectionHiker notes that few cottage packs give buyers this much choice in how the pack meets the body.

Fit. Torso length adjusts from 16 to 22 in on a single pack body, and hip belts come in three sizes keyed to waist measurement. That’s unusual in a category where fixed sizes are the norm. For hikers who fall between a medium and a large elsewhere, or whose torso doesn’t match their height, the adjustability is the main reason to buy.

Fabric and weather. VX21 is a four-layer X-Pac laminate, a 60:40 nylon–polyester blend, and is highly abrasion resistant and waterproof. The roll-top closure keeps the main compartment dry, and owners report the fabric shrugging off both brush and rain. LS21, the gray Liteskin option, is a three-layer waterproof laminate. A Greenbelly reviewer who logged 100 days on trail described a pack that came out worn but intact.

Storage and organization. Inside, there’s a zippered stash pocket for a wallet, and outside, three woven stretch pockets plus hip pockets. A Y-strap tops the roll and doubles as an attachment point for a bear barrel, and later production runs added two side straps so the roll-top can be secured on the side. The extension collar adds roughly 10 L when the resupply is large. The recurring complaint is the side bottle pockets: a Southwest Hikes reviewer found them hard to reach with the pack on, a familiar problem with deep side pockets on a framed pack.

Weight in context. At 1,100 g in the standard framed setup, the Swift X sits well above the lightest packs of its volume. Pull the stay and run the frameless configuration with standard straps and it drops to 765 g, though the recommended load falls to about 25 lb. The one-pack, two-modes flexibility is useful for hikers whose loads shrink after a resupply or whose trips range from overnighters to long-distance routes. Buckle size drew a mild complaint from a long-haul user, as did price.

Pros & Cons

Pros

• Adjustable 16–22 in torso with three hip belt sizes and multiple harness styles
• Hoop stay moves weight to the hips effectively for a pack in this weight class
• Removable frame drops weight to 765 g for lighter loads
• Waterproof, abrasion-resistant X-Pac or Liteskin body
• Vest harness adds easy-reach storage for snacks, phone and bottles
• Y-strap and extension collar handle bulky resupplies and a bear canister

Cons

• Heavier than the Mariposa, Hyperlite 3400 Southwest and Arc Haul
• Hip belt comfort fades toward the 35-lb limit
• Side bottle pockets are awkward to reach while wearing the pack
• $350–$375 is real money, though less than comparable Dyneema packs
• Small buckles draw occasional complaints

Who Should Buy This

The Swift X suits thru-hikers and weekend backpackers with base weights in the lightweight-to-ultralight range who want a framed pack that actually fits. It’s especially good for anyone who doesn’t match a standard small, medium or large, or who likes a running-vest-style front. Hikers consistently carrying more than 30 lb should look at a pack with a beefier belt and frame, and gram-counters who want the lowest possible carry weight will do better with a frameless or lighter-framed design from another maker.

Verdict

The Swift X earns its place as a do-everything long-distance pack: it fits more bodies than most, carries well to about 30 lb, and keeps its shape and its waterproofing over a long trail season. It gives up a few ounces to the lightest competition in exchange for suspension that works. For most thru-hikers carrying a lightweight kit, that’s a good bargain.