How to fit your Macpac

Technical backpacks are where it all started for us. We produced Oceania’s first internal frame design in 1975 and we’ve continued to craft quality gear for adventurers around the world ever since. Today, our range serves everyone from elite climbers to weekend trampers, intrepid backpackers and students alike. And even with all this diversity, we’re able to fit them all from one single measurement.

Find your back length

A free fitting in store is the easiest way to find the perfect pack, but all of our harness sizes are based on effective back length. To find yours, start by locating your C7 cervical vertebra. It’s easiest to find it by looking at the ground and working down your neck — it's the highest vertebra you can feel protruding near its base. There’s no need to press hard because you should feel it easily. This point is usually a bit higher than your shoulders.

Next, find your iliac crest. It’s the highest point on the top of your hip bone. Once you’ve found it, measure vertically from your C7 to the highest side point of your iliac crest to find your Macpac back length.

Pack Sizing

Select your pack size

Use the table as a guide to check which Macpac size best fits your back. If you’re near the bottom of one range, and especially if you’re built lightly, it’s worth trying on the next size down.

The opposite goes for anyone of a solid build. If you’re near the top of a size range — or you prefer to wear your hip belt lower — it’s worth trying the next size up





 S1 39 – 46cm

 W1 37 – 44cm

 S2 43 – 52cm

 W2 42 – 49cm

 S3 50 – 60cm

Women's-specific Packs

These packs have been designed with women’s physiologies in mind.

Shoulder straps curve differently, and sit closer together, to increase comfort across a range of chest sizes without slipping off narrower shoulders. Hip belts also flare differently to fit curved hipbones and a variety of waists.

Between Sizes?

If your measurements are in between what’s listed in the size chart, pick the next larger size.

Doesn't Fit?

Return it within 60 days, as long as it's unworn, unwashed and unaltered.
See Returns Policy

Still unsure?

Find your nearest store and head in for a free fitting.