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Patagonia Nine Trails Backpack 15L - 915cu in


Item # PAT00P5

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Item # PAT00P5

A low-profile day pack made to go fast.

Designed for trail running and fast hiking, the Patagonia Nine Trails Backpack fits like a vest but has the storage capacity of a day pack. The Air flow mesh vest promotes breathability and sits close against the body so the pack doesn't swing excessively or throw you off balance while you're running. The pack consists of a hydration compatible design along with a folding top load and zippered main compartment. A DWR treated nylon ripstop fabric keeps your valuables dry when they're in the pack, while two front pockets are a great place to stash energy gels, snacks, and your phone.

  • Air flow mesh vest-style shoulder straps
  • Foam back panel with mono mesh
  • Folding top load with zippered main compartment
  • Weather-resistant nylon ripstop fabric
  • Hydration compatible
  • Two front pockets (one zippered)
  • Integrated compression straps

Tech Specs

100% ripstop nylon (100D face / 210D bottom), polyurethane coating, DWR treatment
915 cu in
foam back panel
Shoulder Straps:
Air Flow-mesh
Waist Belt:
Hydration Compatible:
1 lid security, 2 shoulder strap, 1 main organizer
Claimed Weight:
10.8 oz
Recommended Use:
hiking, trail running
Manufacturer Warranty:

Size chart


 SLOne Size
Torso 16 - 19in
(40.6 - 48.3cm)
19 - 22in
(48.3 - 55.9cm)
17 - 20in
(43.2 - 50.8cm)
Waist 28 - 36in
(71.1 - 91.4cm)
32 - 42in
(81.3 - 106.7cm)
26 - 42in
(66 - 106.7cm)
How to Measure:
-Have a friend locate the bony bump at the base of your neck, where the slope of your shoulder meets your neck. This is your 7th cervical vertebra (C7). Tilt your head forward to locate it more easily. This is the top of your torso length.
-Place your hands on top of your hips bones, with fingers point forward, thumbs in back. This it eh "shelf" on which your pack will rest. The middle of an imaginary line drawn between your thumbs is the bottom of your torso length.
-Using the tape measure, your friend should measure the distance between the C7 and the imaginary line between your thumbs. Be sure you stand up straight when being measured. You know should have your torso length.
Measure around your waist just above your hips.

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Perfect for running

  • Familiarity: I've put it through the wringer

Well, I started running a little while ago. I had about 6 camelbak/other brand bladders from other packs and was looking for something of the vest type because I hate the idea of holding my water and waist packs. I also wanted somewhere for my phone and food to go when I ran more than a hour and wanted some extra snacks to keep going.

I love Patagonia so I looked at this initially, but after looking at many alternatives I chose this due to the price. I don;t regret it at all! It fits great and is super light. I love the pockets in front, it fits my 70oz hydration bladder pretty well (not perfect but it works totally fine) and it has extra room in case I leave home when it's cold with a jacket and want to ditch it later on.

I couldn't be happier.

Perfect for hydration when running

  • Familiarity: I've used it several times

I am newish to running. I have run before, but I would have considered a 10k LONG. Now I am running 3-4 times a week, and typically 6 mi would be an average/short run. I really needed something to carry water in as I was starting to really feel out of it without weather for an hour long run.

I could fit my 2 and 3 liter camelbak in the pack. I just flipped it upside down and squeezed out the air and all was fine, although a 1.5 liter would probably fit perfectly. The pocket on the shoulder is a little small for my iPhone 6s, but if I let the headphone poke out the hole where the zipper would close its fine. Although the it could also just be put in the top pocket.

The sternum straps don't adjust, which I have seen with more expensive vests, but the pack weights nearly nothing, fit great, doesn't move around hardly at all, and I much prefer it over carrying bottles or having water bottles right on my chest like many vests have.

All in all, I think it's prefect, and for $80, it's really a good deal too.

Fun small pack.

  • Familiarity: I've used it once or twice and have initial impressions

I like this pack a lot, the size is great and can store more than you think, however, the only negative that I've found is that my shirt rode up while running with this pack. I may be able to fix this by wearing a longer shirt and packing less in it, but I was trying to test it out with a little bit of weight. Overall looks great and makes a fun hiking pack so you don't bring to much with you, but carry the essentials.

The ticket to downsize your day.

  • Familiarity: I've used it once or twice and have initial impressions

Fast schmast. This pack does that for sure; the load is part of you, and I put about as much in this pack for its first eleven-mile dry run as one might want to. So yep, run. Go fast as you can. But it's not, for me, about making the 200-miler possible; it's about making the ten to fifteen more fun. When you aren't tempted to add more stuff you don't; the front shoulder strap pockets keep the energy snacks available for the big uphill pulls and the smartphone ready for the glory shots; and I got rainshell insulation gloves warm hat mondo headlamp food (how's a steak and wine lunch sounding to you?) water puro and forty-eight ounces of nicely frozen water in there for a delightful day under a blazing sun. This one was well thought out and a pleasure to drive.