I asked a professional guide about his favorite bottle (water bottle) to bring to the backcountry

One of the must-have equipment for going out in the backcountry (BC) is a “water bottle”. Hydration is essential in BC, where there is a lot of activity due to repeated hikes and slides. In addition, it is also a pleasure to take a break, such as taking sugar to replenish energy, and delicious soup and coffee. So the question is, "What kind of water bottle do you want?" There are multiple points to check when choosing a water bottle, including not only heat and cold insulation functions, but also durability in cold weather, ease of use, lightness and capacity. So, I asked the experienced professional guides in BC what kind of water bottle they usually use, and why.

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Choices that suit your time and purpose

The choice of how many water bottles to bring to the backcountry depends on the season, the length of the tour, and the purpose of use. For example, during the harsh winter, people want hot drinks to warm themselves up on snowy mountains. But if the weather is sunny and warm in the spring season, you're sweating and thirsty from hiking, and you're craving cold water. Professional guides plan the tour itinerary in detail, grasp the amount of activity for the day, including climbing and sliding, and adjust the drinks to bring to the mountain according to the time of the tour and the weather. ing.

What is often used in hydration only

PLATYPUS | Platy 2L bottle

Voices of favorite BC guides

The water bottle is Platypus 2L. It shrinks as it consumes its contents. It can also be used as an emergency hot water bottle. ( Telemark School & Ski Guide Izumiya AK.T | Kenji Akutsu)

PLATYPUS hydration system for hot days. ( RIKI JAPOW GUIDE | Riki Nakajima)

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Chosen for its light weight

nalgene ｜ Wide Mouth Tritan 1.0L / 0.5L

Nalgene is loved by outdoor users all over the world for its high-purity plastic and high airtightness. Uses eco-friendly "saturated polyester resin" from the USA, so the smell of plastic does not transfer to drinks. The body heat and cold resistance temperature of the bottle body is 100 ℃ ~ -20 ℃, and it is light and durable while having sufficient heat resistance and cold resistance.

The unique cap system that completely seals does not use packing, so it is easy to wash and hygienic.

1.0L is a popular bottle representing nalgene. There is not only a wide-mouthed type but also a narrow-mouthed type. From outdoor activities to daily use, it is widely used regardless of the scene. Even with the same wide mouth Tritan 1.0L, there are various colors and graphics, so it's fun to choose.

Click here for the official website

Voices of favorite BC guides

Put 500ml of Nalgene in a cold-proof case and add boiling sports drink.
And 500~1000ml of THERMOS. A thermos bottle with a large cup is convenient for children. We think that thermal insulation power does not change and are cheap. ( Kuroda Mountain Guide Office | Makoto Kuroda)

I don't know the model of the Tiger thermos bottle, but I've been using the 0.5L size for over 15 years, but it still retains heat.
And nalgene1L. I can't break it! ( LOCUS GUIDE SERVICE | Kazuya Furuse)

nalgene bottles and THERMOS.
Nalgene bottles contain oral rehydration solutions.
Wide mouth 0.5ℓ is easy to use. Thermos in hot water. The winter thermos uses 0.75ℓ. Use 0.5ℓ in spring. ( Rhythm Works ｜Ryuta Asahi)

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Chosen for heat retention and ease of use

THERMOS｜ Bottle

A "mountain-only bottle" for the harsh conditions in the mountains. Popularly known as “Yamasen”, he has gained overwhelming support from mountain climbers and mountain guides. The silicone body ring that you can grip firmly, the bottom cover that is resistant to impact, and the simple screw that is easy to handle even with gloves on, make it the best in snowy mountains.

	FFX-901	FFX-751	FFX-501
capacity	900㎖	750㎖	500㎖
Thermal insulation effect * (6 hours)	80°C or higher	78°C or higher	77°C or higher
Cooling effect * (6 hours)	9°C or less	10℃ or less	10℃ or less
weight	380g	360g	280g
price	￥7,150	￥6,600	￥6,050
Color	All three colors: Mad Red, Matte Black, and Matte Stainless	Available in 3 colors: clear stainless steel, matte black, and sand beige	Available in 3 colors: sand beige, matte black, and clear stainless steel
Dedicated pouch	￥2,640	￥2,420	￥1,980

*The heat retention effect is defined as filling the product with hot water up to the lower end of the liner at a room temperature of 20°C ± 2°C, and when the water temperature is 95°C ± 1°C, leave the product in a vertical position for 6 hours with the inner liner and cup attached. the temperature of the water in the case of The cold insulation effect is measured by filling the product with water at a temperature of 4°C or less to the bottom of the core at room temperature of 20°C ± 2°C, and placing it vertically with the core and cup attached when the water temperature is 4°C ± 1°C. Indicates the temperature of the water when left for hours

Click here for the official website

Voices of favorite BC guides

Bottle: Yamasen Bottle 900ml Heat retention is unparalleled. I put hot water in it. ( Telemark School & Ski Guide Izumiya AK.T | Kenji Akutsu)

I love the Thermos mountain bottle 900mL or 500ml. Stable ease of use! ( Vertical Land | Hiroki Ito)

Yamasen bottle 750ml. It doesn't get in the way even if you put it sideways in the rucksack. ( Tyrol ｜Iwao Saeki)

THERMOS 500ml. The reason why I love it is because of its light weight, slim silhouette, and moderate heat retention. ( COLOR SPORT CLUB | Tomohiro Shakawa)

THERMOS 350ml is perfect for tea, tea, coffee and more.
Mizu 500ml or Yamasen 500ml is for hot water only. ( RIKI JAPOW GUIDE | Riki Nakajima)

THERMOS mountain dedicated bottle 0.5L. The most reliable bottle for heat retention. ( Infield | Toyokazu Nakano)

THERMOS Yamasen Bottle Light and easy to handle even with gloves on.
Reliable with overwhelming heat retention. ( Bantei ~bamboo tail~ | Yuu Takeo)

THERMOS! Good heat retention. ( Kagura Powder Station | Kazuya Igarashi)

THERMOS Yamasen bottle. On a one-day tour, I rarely drink, so I carry it with me for emergencies. ( Epic Japan | Akiko Nakae)

THERMOS! Trust and performance ( Daichi Terui )

Competitor of "Yamasen" and also highly reliable for heat retention

mont-bell｜ALPINE THERMO BOTTLE

A lightweight and compact thermo bottle developed for mountaineering that exhibits outstanding heat retention even in extremely cold environments. SUS304 stainless steel with excellent strength is used on the outside of the main body, and SUS316 stainless steel, which boasts outstanding corrosion resistance, is used on the inside. Specifications that are easy to handle even when wearing gloves, such as a non-slip silicone rubber and an inner plug that can be opened and closed with a half-turn. Depending on the purpose, you can choose between a direct drink type that allows you to quickly replenish water and an inner plug / cup type that has a higher heat and cold insulation effect.

The 0.5L model has a track record of winning the "OutDoor INDUSTRY AWARD 2016" WINNER at Europe's largest outdoor international trade fair "OutDoor Show 2016".

	BOTTLE 0.9L	BOTTLE 0.75L	BOTTLE 0.5L	BOTTLE 0.35L
capacity	900㎖	750㎖	500㎖	350㎖
Thermal insulation effect * (94°C at start → 6 hours later)	81°C or higher	80°C or higher	78°C or higher	74°C or higher
Cold insulation effect * (4°C at start → 6 hours later)	70°C or less	80°C or less	8°C or less	10℃ or less
weight	380g	360g	265g	240g
price	￥4,950	￥4,400	￥3,850	￥3,300
Color	All 2 colors of stainless steel and red	All three colors of dark gray red stainless steel	Available in 4 colors: dark gray, red, stainless steel, and green	All 4 colors of green, dark gray, red, and stainless steel

* Heat and cold insulation effect (effect) is the temperature when the product is filled with the specified amount of hot water of 95 degrees (cold water of 4 degrees) at a room temperature of 20 degrees (± 2 degrees) and left for a predetermined time (6 hours).

Voices of favorite BC guides

I don't have any special preferences, but I use mont-bell's Alpine Thermo Bottle 0.9L.
Whether it's mont-bell or THERMOS Yamasen bottle, we recommend a bottle with high heat retention in winter. ( CIRCLE GAME guide service | Shohei Sasaki)

Alpine thermo bottle 0.5L from mont-bell! Excellent heat retention. ( Mountain Guide Coyote ｜Ryuta Furuichi)

I have two mont-bell 0.35 and THERMOS 0.15 or 0.18. The big one is for emergency use (when you drink it, it will always expand and cool down during the action), and you won't use it until the end. Drinking is limited to small bottles and 500ml cold PET bottles. ( Hokkaido Backcountry Guys | Satoshi Tsukahara)

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I want to read it together!

I want to read together

High-spec thermos water bottle, verifying its ability in snowy mountains | Can you eat hot cup noodles on the mountain? This series project is a report from the user's perspective while trying to use items on the snow that seem to make snowy mountain time and snowy mountain skiing comfortable and enjoyable, and trying to verify how it actually works.