Pack Liner vs Rain Cover: Which One Actually Keeps Your Gear Dry?
A pack liner solves a different problem than a rain cover, and understanding the difference changes which one you reach for. A rain cover goes over your pack and protects the outer shell from getting saturated. In light rain, it does the job. In sustained downpours, sustained creek crossings or overnight condensation inside a wet tent, water finds its way through the zip pullers, frame channel gaps and pack base regardless and a rain cover does nothing for any of that. A liner addresses all of it by sealing the inside of your pack from the top.
When Does a Pack Liner Outperform a Rain Cover?
In three specific scenarios, a pack liner is more reliable than a rain cover: sustained rain over multiple hours, river or creek crossings where the pack base makes contact with water, and situations where condensation accumulates inside a tent overnight and transfers to the pack.
In all three cases, the liner's internal seal keeps your sleep kit dry regardless of what gets past the outer shell.
For day hikes in variable weather, a rain cover from the pack accessories collection is often enough. But for multi-day trips in unpredictable Australian conditions, a liner and a rain cover used together are the most reliable combination. The liner protects what matters: your sleep system and clothing, while the rain cover keeps the outer pockets and shell from becoming saturated.
Nylofume vs Standard Pack Liners: What Is the Difference?
The Neve Gear Nylofume Waterproof Pack Liner uses Nylofume film, a lightweight, highly compressible material with zero water permeability. It packs to almost nothing, weighs next to nothing, and seals reliably around the top of your pack when rolled down. It is Australian-made, designed with local conditions in mind, and not widely available outside ULG.
The Osprey Ultralight Pack Liner uses a lighter nylon construction with a drawstring closure, suited to hikers who want a liner that integrates cleanly with their Osprey pack's internal volume. It is sized to match Osprey pack capacities and is the tidier fit if your pack is in the Osprey range.
Both options are reusable, compressible and add under 100g to your base weight. For hikers building an ultralight hiking pack setup, either sits comfortably within a dialled kit.
How to Use a Pack Liner Correctly
A pack liner works as a bag-within-a-bag. Open the liner, place it inside your pack with the open end at the top, load your gear into the liner rather than directly into the pack, then roll the top of the liner down three or four times and tuck it in. The rolled closure creates the seal. Don't close it with a clip or tie; the roll keeps water out.
Sleep kit, down layers and electronics go inside the liner. Snacks, a rain jacket and anything you access frequently can sit in external pockets outside the liner, where a rain cover handles the weather protection. Use the liner for gear that cannot get wet.
Staff Picks: What Our Team Uses for Wet Australian Conditions
For any multi-day trip with a chance of significant rain, the Neve Gear Nylofume is the liner our team reaches for. It is lighter than it looks, rolls to the size of a fist, and gives genuine peace of mind on trips where the weather is unpredictable.
And for Osprey pack owners, the Osprey Ultralight Pack Liner is a near-perfect fit for the pack's internal geometry and is the tidier option if you prefer a liner that was designed for your specific pack.
Wondering which pack liner to get?
If you’re not sure whether a liner, a rain cover or a combination of dry bags is the right waterproofing approach for your kit and conditions, come visit the Ultralight Gear store in Alexandria. Our team will walk you through the options and even do price-matches if you found it cheaper at another store.
Frequently Asked Questions
Do I need both a pack liner and a rain cover?
Not always, but together they form the most complete waterproofing system. A rain cover protects the outer shell and pockets in light to moderate rain. A liner protects the contents if water gets past the shell. For day hikes in variable weather, a rain cover alone is usually sufficient, but for multi-day trips in sustained rain or creek-crossing terrain, both together is the reliable choice.
What size pack liner do I need?
Match the liner to your pack's maximum volume in litres, not its loaded volume. A liner sized for a 50L pack fits inside a 50L pack with room to roll down the top and seal properly. If your pack sits between sizes, choose the larger liner. A liner that is too small will not roll down enough to create a reliable seal at the top.
Can I use a bin liner as a pack liner?
You can, and many hikers do for a single trip. A heavy-duty bin liner weighs almost nothing and provides basic waterproofing in light rain. The trade-off is durability: bin liners puncture easily on pack frame stays and rough gear edges, and the seal at the top is less reliable than a proper roll-top closure. A dedicated pack liner is more reliable across multiple trips and conditions.
Is a Nylofume pack liner reusable?
Yes. The Neve Gear Nylofume Waterproof Pack Liner is fully reusable. Nylofume film is durable across repeated use, resistant to puncture from normal pack contents, and maintains its waterproof properties wash after wash. After a trip, shake it out, wipe it down if needed, and pack it away rolled. It does not need any retreatment or re-coating between uses.
How do I dry a pack liner after a wet trip?
Turn it inside out and hang it open in a well-ventilated area. Both the Osprey and Neve Gear liners dry quickly because the materials are non-absorbent. Avoid direct heat sources like a clothes dryer or direct sun for extended periods, as sustained heat can affect the liner's integrity over time. Once fully dry, roll it loosely for storage rather than folding to avoid permanent crease lines.
Will a pack liner work in a frameless ultralight pack?
Yes. A pack liner works in any pack regardless of whether it has a frame. In a frameless pack where a sleeping pad slots down the back panel as a framesheet, load the liner around the sleeping pad rather than over it; the pad stays against your back, and the liner seals everything else inside. This is the standard setup for most ultralight hikers using a frameless pack with an internal pad.
