How to Choose an Ultralight Backpack for Multi-Day Hiking
The core question when choosing an ultralight backpack is which construction suits your current base weight. A frameless pack in the hands of a hiker carrying 12kg is a recipe for discomfort, while a framesheet pack on a hiker with a 4kg base weight is unnecessary complexity. Getting the construction right first makes every other decision easier.
Frameless vs Framesheet: Which Construction Suits Your Base Weight?
A frameless pack has no internal structure; it relies on your sleeping pad (slid down the back panel) or a folded foam pad to give the pack its shape and transfer weight. This works exceptionally well below 8kg total pack weight. At that load, a frameless pack sits close to the body, moves with you on uneven ground, and carries without any perceptible wobble. The Gossamer Gear Kumo 36, the Pa'lante Joey and the HMG Unbound 55 are examples of packs designed around this principle.
A framesheet pack adds a thin, removable plastic or carbon sheet that gives the pack a rigid back without adding the full weight of an aluminium stay system. This suits hikers carrying 8–12kg who want some structure and load transfer without committing to a fully framed back system. The Durston Kakwa 55 and the Neve Gear Wallaroo Pro 55L are framesheet designs built for this middle ground.
If your kit isn't consistently below 10kg, it is worth looking at our range of traditional hiking backpacks with a structured back system while you dial your base weight down.
What Capacity Do You Need for an Ultralight Multi-Day Setup?
With an ultralight sleep system (quilt, tarp or lightweight tent, sleeping pad), most hikers find a 45–55L pack handles three to five nights without strain. Below 40L is achievable for two nights if your sleep kit compresses well. Beyond 60L usually signals either a longer trip or a sleep system that still has room to get lighter.
The capacity decision also depends on how you carry water and food. A pack with good hip belt pockets and external bottle sleeves lets you access weight-forward items without stopping, which matters more on a five-day carry than a one-nighter.
Organisation inside an ultralight backpack is sparse by design: a stuff sack or two and a dry bag for your sleep kit cover most hikers' needs without adding unnecessary weight.
Which Brands Build the Best Ultralight Hiking Packs?
For the lightest possible construction in Australian conditions: Hyperlite Mountain Gear builds its packs from Dyneema Composite Fabric (DCF), a material that is waterproof, extremely tear-resistant and weighs almost nothing. The Southwest 55 and Unbound 55 are the benchmark for serious ultralight hikers who do not compromise on weight.
If it’s about the best value-to-weight ratio available in Australia, Durston Gear's Kakwa 55 is the pack we recommend most often. It is framesheet-supported, well-organised for its weight class, and priced significantly below comparable HMG options. One of the few brands where weight savings and price align.
For an Australian-made option with local conditions in mind: Neve Gear's Wallaroo Pro 55L is built in Australia specifically for the terrain here, such as granite, scrub, creek crossings and variable weather that other brands do not design around. It is available through ULG and not stocked elsewhere in the country.
Staff Picks: What Does Our Team Carry on Extended Multi-Day Routes?
For three- to five-night walks, the Durston Kakwa 55 is our most recommended pack across the board. The combination of framesheet support, roll-top organisation and weight makes it the most versatile option in the collection for Australian conditions.
But for hikers with a truly dialled base weight below 6kg, the Gossamer Gear Kumo 36 carries light enough that you genuinely stop noticing it by the end of day one, which is the point.
Not sure whether frameless is right for your current kit?
Ultralight Gear in Alexandria, Sydney is open if you want to come visit. We will load a pack to your base weight so you can feel the difference before you commit. We also price-match if you saw it sold cheaper somewhere else.
For wet weather packing, a pack liner inside your ultralight pack keeps your sleep kit dry without the weight of a separate rain cover. And if you are still working on your sleep system and shelter, the pack accessories collection covers compression and organisation options that help lighter packs work harder.
Frequently Asked Questions
What is a good base weight for ultralight backpacking?
Base weight is everything in your pack except consumables (food, water, fuel). The ultralight benchmark is under 4.5kg. Sub-3kg is considered superlight. Most hikers starting their ultralight journey land between 5–7kg and reduce from there as they replace heavier gear items one by one. Your pack choice should reflect your current base weight, not the one you are working toward.
Can an ultralight backpack handle an 8kg load comfortably?
Yes, with the right construction. A framesheet pack like the Durston Kakwa 55 or Neve Gear Wallaroo Pro 55L carries 8–10kg comfortably because the framesheet transfers load to the hip belt. A fully frameless pack at 8kg becomes less comfortable; the load shifts forward and the back panel loses its shape without a sleeping pad to support it. Match your pack construction to your actual loaded weight, not your aspirational base weight.
What materials are used in ultralight backpacks?
The main fabric types across this collection are Dyneema Composite Fabric (DCF, also called cuben fibre), silnylon, silpoly and UHMWPE-reinforced nylons. DCF is the lightest and most waterproof. Silnylon and silpoly are lighter than standard nylon and water-resistant but not fully waterproof under sustained rain. UHMWPE-reinforced fabrics (used by Durston and Neve Gear) balance abrasion resistance with weight savings. Each material involves a trade-off between weight, durability and weather resistance.
Are ultralight packs durable enough for rocky Australian terrain?
The short answer is yes, when you match the fabric to the terrain. DCF packs (HMG) are highly tear-resistant but can abrade on granite over time if dragged or set down carelessly. Reinforced nylon packs (Durston, Neve Gear) handle Australian scrub and rocky ground well because the abrasion points are reinforced. The trade-off for durability in this weight class is care on trail.
What is the difference between Durston and Hyperlite Mountain Gear?
Both make excellent ultralight packs, but they approach the problem differently. HMG uses DCF throughout, which gives a waterproof, extremely light shell but at a higher price point. Durston uses a reinforced nylon construction that is heavier by 50–100g but more abrasion-resistant and significantly less expensive. HMG suits the hiker who values the lightest possible pack and is willing to pay for it. Durston suits the hiker who wants meaningful weight savings without the premium cost.
Do I need a pack cover for an ultralight backpack?
It depends on the fabric. DCF packs (HMG) are inherently waterproof and do not need a cover. Silnylon and reinforced nylon packs are water-resistant but not waterproof under sustained rain. A pack liner inside the pack is more effective than an external cover at keeping your sleep kit dry because it protects your gear even if water gets in through the zip or roll-top, while a dry bag for your quilt or sleeping bag adds a second layer of protection on wet multi-day trips.
