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Pack Liner
An ultralight, dependable way to keep your kit dry when the weather turns, the miles get wetter. If any sizes are unavailable, our next restock will be in August.
Choose the size of Atom Pack you have.
Designed specifically to fit the shape of your pack, our pack liners provide a simple and reliable way to keep your gear dry. Made from an ultralight, waterproof D50T fabric with bonded seams, they create a waterproof barrier inside your pack, protecting your essential gear from the elements.
If you have an Atom 35L, choose the 40L pack liner.
If you have a Nanu, choose the 30L pack liner.
| 30L | 76g | 2.6oz |
| 40L (inc. Prospector) | 89g | 3.1oz |
| 50L | 93g | 3.3oz |
| 60L | 104g | 3.6oz |
How to use:
Place the liner inside your pack and connect them together using the poppers. This keeps the liner open and secure whilst you pack. Once your gear is loaded, undo the poppers, roll the top of the liner down several times and clip the buckles together to create a secure, weather-resistant seal.
Available to purchase with custom orders at any time.
If you want a Pack Liner adding to an existing custom order, please email hello@atompacks.co.uk
How to measure your Torso
Follow our 5-step guide to find the perfect fit.
Please note!
Your torso size is not necessarily linked to your height or weight. If you take a large t-shirt it won’t necessarily mean your torso is a size large. So please, measure before buying.
Finding an accurate measurement is simple, but you may find it easier if you ask someone to help you measure up.
1. Find your C7 vertebrae

Tilt your head forward and find the bony bump at the base of your neck - this is your C7 vertebrae and the top point of our measurement. Place the top of the tape measure or string here and then tip your head back up to neutral.
2. Find your iliac crest
Place your hands on the top of your hip bones with your thumbs pointing towards your spine. Draw an imaginary line between your thumbs, where this line meets your spine is your iliac crest. If you are measuring on your own, then adjust the waistband of your trousers to sit at this point and tighten your belt - you will measure to the top of your belt.
3. Measure the distance between the two
Measure from the C7 down to the iliac crest (or your belt if you are measuring solo): make a note of the number - this is your torso size.

4. Measure again
A wise person once said, measure twice: cut once. Custom packs are non-refundable, and returns are painful for everyone, so take the time to get this right. Apply a little common sense at this point - if you normally wear Small t-shirts but have measured as an X-Large, maybe let's go back to step 1! If you are unsure, please send us an email and we can help.
5. Torso size
Once you are satisfied with your measurement, refer to the table below to find your size. If you are in between two sizes, going for the smaller of the two will ensure a good fit - trust us on this.
| Torso Size | Inches | Centimetres |
| Small | 15-17 | 38-43 |
| Medium | 17-19 | 43-48 |
| Large | 19-21 | 48-53 |
| Tall | 21-23 | 53-58 |
Secure Popper Attachment
Constructed in D50T
Roll Top Closure
Needs met.
Pack Liner. An ultralight, dependable way to keep your kit dry when the weather turns, the miles get wetter. If any sizes are unavailable, our next restock will be in August.
All our bags are designed and tested to meet a specific need. Each item is built by hand to our incredibly high standards right here in our Keswick workshop.
Pack Liners FAQ
What is a pack liner?
Why do you recommend using a pack liner?
Are they waterproof?
What are they made from?
What are the poppers for?
Do I need to buy the matching size for my Atom Pack?
I have a backpack from another brand. Can I use your pack liners?
What’s the best way to pack a pack liner?
How much weight do they add?
Why does the Prospector 40L have its own pack liner?
Shipping
The current lead time for this product is 2 weeks.






