Pack Liner, Polycro, 25g
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Keep your quilt and spare layers bone-dry without hauling a heavy dry bag. This ultralight polycro pack liner creates a fully waterproof barrier inside your pack while adding almost zero weight.
Ultralight Polycro Pack Liner
The Ultralight Polycro Pack Liner is a minimalist waterproof barrier designed to keep your gear dry inside your backpack. Built from high-clarity polycro film, it weighs almost nothing yet provides dependable protection against rain, moisture, and condensation during long-distance hiking.
Why You Need a Pack Liner
Even with a good backpack, moisture can enter from heavy rain, creek crossings, or humidity. A pack liner creates a sealed internal layer that protects essential items like your down quilt, clothing, and electronics — the gear you absolutely cannot afford to get wet.
Key Features
- Ultralight polycro film — extremely low weight with excellent waterproof properties.
- Durable for its weight — more tear-resistant than standard plastic liners.
- Full-height coverage — lines the entire inside of your backpack for maximum protection.
- Clear transparency — makes it easier to see your gear while packing.
- Packable — folds down unbelievably small when not in use.
- Simple roll-top closure — squeeze out air, twist or fold the top, then close your backpack.
How to Use
- Place the liner inside your backpack.
- Put all moisture-sensitive gear (quilt, jackets, clothing, electronics) inside the liner.
- Squeeze out excess air for a compact pack.
- Roll or twist the top to create a sealed barrier.
Specifications
- Material: Polycro high-clarity waterproof film
- Weight: Extremely lightweight (see product page for size-specific values)
- Sizes Available: For 35–60 L packs (various dimensions depending on variant)
- Color: Clear / transparent
- Pack Options: Single or 2-Pack depending on variant
Best For
- Ultralight backpacking
- Thru-hiking
- Tarp / minimal shelter systems
- Wet or unpredictable climates
- Backpackers who prefer liners over dry bags to save weight
Usage Tips
- Do not overstuff; leave space to roll the top for a proper seal.
- Keep sharp objects away from the film to extend the lifespan.
- For maximum protection, store all down and electronics inside the liner at all times.
- If a small hole develops, the liner still works well as long as the top is sealed.
Who It’s For
Designed for hikers who value simplicity and performance. If you want efficient waterproof protection at the lightest possible weight, this polycro liner is a must-carry piece of your ultralight kit.
