The On Ultra Vest Pro is On's top trail vest, coming with a 10L dry pack and 2 500ml flasks from the start. The Japan official price is JPY 26,400 (tax included).
The Shoe Nerd's top pick
The Ultra Vest Pro is On's serious vest for long trails where you carry gear and water together. A 10L pack with flasks that hold 1L of water, for JPY 26,400. Having little to buy before you start running is this piece's biggest strength. I would decide after wearing it in a shop.
Key points
- 10L dry pack with two 500ml flasks
- The Japan official price is JPY 26,400 (tax included). JPY 2,640 per 1L of capacity
- 5 sizes, XS to XL, and you can choose the label size
Who is the On Ultra Vest Pro for? The top vest that comes with 10L and 1L of water
The On Ultra Vest Pro is a trail running vest with a 10-liter dry pack and two 500ml flasks. Its position is On's "top trail running vest."
The Japan official price is JPY 26,400 (tax included). It is 1 vest for long trails where you carry gear and water together.
How to compare it with other vests is in the vest and pack comparison article.
Ultra Vest Pro official numbers (release date, price, capacity)
| Item | Official numbers |
|---|---|
| Release date | On sale on the Japan official site (listing of Oct 15, 2026) |
| Price | JPY 26,400 (tax included) / US $200 |
| Pack | 10L dry pack |
| Included | 2 Hydrapak 500ml flasks |
| Sizes | XS, S, M, L, XL (true to size) |
| Colors | Black, White |
| Material | Front: 100% polyester / back and pockets: 85% polyamide, 15% elastane / bag: 100% polyamide |
On's top vest, claiming "next generation" and "improved fit."
Image: Rakuten Ichiba
On Ultra Vest Pro
Lowest price on Rakuten Ichiba: JPY 26,400 (as of 10/15). Prices change daily. For apparel, compare the maker's size chart (height, chest, waist) with your own measurements. If in doubt, check the shop's return and exchange terms.
RecommendedSee it on Rakuten IchibaSee it on Yahoo! Shopping JapanHow does it differ from the previous Ultra Vest 10L?
Lined up by capacity, flasks and dollar price.
| Item | Ultra Vest 10L (2023) | Ultra Vest Pro |
|---|---|---|
| Pack | 10L | 10L |
| Flasks | 500ml × 2 | 500ml × 2 |
| US price | $179.99 | $200 |
The price gap is 200 − 179.99 = $20.01, or 20.01 ÷ 179.99 = about 11.1%. They are prices from different years, so read it as a rough guide.
Pack size and number of flasks are the same as the 10L. What the Pro polished is how it follows the body (fit).
How does it differ from the RUSH 11R at the same price?
The JPY 26,400 price is the same as the domestic Paagoworks RUSH 11R. What the money goes to differs.
| Item | Ultra Vest Pro | RUSH 11R | RUSH 7R |
|---|---|---|---|
| Price | JPY 26,400 | JPY 26,400 | JPY 22,000 |
| Capacity | 10L | About 12 L | About 6.5 L |
| Flasks | With 2 × 500ml | Buy separately | Buy separately |
At the same price, the Ultra Vest Pro even includes 1L of flasks. For someone assembling gear from scratch, that whole portion counts. If you want about 2L more capacity, RUSH 11R; for small and light, RUSH 7R is another way to choose.
Reading 10L and 1L of water in numbers
Water in the flasks is 500 × 2 = 1,000ml. So you can carry 1L of water when you start. With the 10L pack, the idea is to put water and gear into 1 vest.
Dividing the price by capacity: 26,400 ÷ 10 = JPY 2,640 (per 1L of pack). The included flasks are also in this price.
What is good about the Ultra Vest Pro
The 1st is that water comes included. Two 500ml flasks come with it, so you can start running without looking for them separately.
The 2nd is the 10L pack. A size that lets you gather the gear that grows on long trails into this one vest.
The 3rd is the stretchy material. The back and pockets are 85% polyamide, 15% elastane, which stretches with the load and follows the body.
The 4th is that sizing is "true to label." Being able to choose your usual size is reassuring for people buying online.
Things to watch
First, stock. On the Japan official site on Oct 17, every listed size was out of stock, and a button to receive restock notifications was showing.
The 2nd is the price. In dollar terms, it is about $20 higher than the 10L.
Who the Ultra Vest Pro suits
- Run long trails carrying water and gear together
- Want a form that carries 1L of water from the start without buying flasks separately
- Want to choose On's vest in its top model
If most days you carry little, a smaller-capacity vest is another way to choose.
As someone who runs 500km a month, I look at a vest's load numbers (capacity, water volume, weight) first. The Pro is 10L and 1L of water (2 × 500ml).
Price and where to buy
| Vest | Official price | Rakuten price range | Where to buy now |
|---|---|---|---|
| Ultra Vest Pro | JPY 26,400 (US $200) | JPY 26,400 | Japan official (out of stock on Oct 17) |
The Japan official shows out of stock on Oct 17. Wait for restock with the Japan official's "notify me," or check shop listings.
Overall vest choice is in the vest and pack comparison article, and race mandatory gear in the trail running mandatory gear article. On's 2026 new releases are in the On 2026 new releases article.
On Rakuten, On's other vests and similar-named items also show up, so check that the product name includes "Ultra Vest Pro."
Image: Rakuten Ichiba
On Ultra Vest Pro
Lowest price on Rakuten Ichiba: JPY 26,400 (as of 10/15). Prices change daily. For apparel, compare the maker's size chart (height, chest, waist) with your own measurements. If in doubt, check the shop's return and exchange terms.
RecommendedSee it on Rakuten IchibaSee it on Yahoo! Shopping JapanFAQ
Can I buy the Ultra Vest Pro now?
On the Japan official site on Oct 17, 2026, every listed size was out of stock, and it was taking restock notifications. The price is JPY 26,400 (tax included).
How does the Ultra Vest Pro fit?
It is built so you can choose your usual size. Sizes are XS, S, M, L and XL.
How does the Ultra Vest Pro differ from the Ultra Vest 10L?
The 10L pack and 2 × 500ml flasks are the same. The Pro is a next-generation model claiming better fit, and its dollar price is $200.
Gear in this article
Ads and images: Rakuten IchibaSources
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