Tantrums: trail gear for when it gets really long

After ten kilometers, you can still ignore a lot of the material. After a hundred kilometers, you feel every bounce, irritation, and awkwardly placed compartment. Tantrums develops hydration packs and performance gear specifically for trail runners and endurance athletes., with a clear philosophy: no gimmicks or unnecessary details, but equipment that becomes almost part of your body during prolonged exertion.

That makes Tantrums interesting for ultrarunners, long mountain days, and trail runners who prefer to choose their equipment right once rather than constantly correcting it along the way.

Why a Tantrums hydration pack?

A good trail vest should carry enough without you constantly noticing that you are carrying anything. Tantrums therefore focuses strongly on stability, freedom of movement, accessible storage, and low wearing comfort during prolonged exertion.

The Roam 11, for example, is designed for the longest races and self-sufficient mountain days. The 11-liter capacity offers room for nutrition, clothing, and mandatory race gear, while the construction is intended to distribute weight across the back and limit bounce. There is room for two 600 ml soft flasks in the front, and a 2-liter reservoir can be carried in the back.

The result: less hassle with your vest, more focus on pace, nutrition, and the trail ahead.

Gear that has to prove itself over 250 miles

Tantrums emphatically positions itself on the heavy side of trail running and ultrarunning. This is made even more tangible by athletes such as Rachel Entrekin, who won the Cocodona 250 Outright in May 2026. She covered over 250 miles through Arizona in 56:09:48, finished ahead of every man and woman in the field, and set a new overall course record. Tantrums is named as one of her equipment partners.

Of course, that doesn't mean you have to walk 400 kilometers yourself to benefit from this gear. It primarily shows the type of use for which Tantrums are being developed: long hours, many kilometers, and as little room as possible for irritations or equipment problems.

Which Tantrums pack suits you?

Focus primarily on how much you need to carry yourself along the way. For shorter trails and races where aid stations are close together, a compact vest is often sufficient. If you are going away for longer, running in the mountains, or need to carry extra nutrition, layers, and mandatory gear, then more volume provides peace of mind.

The Crest 6 Hydration Pack sits on the more compact side at 6 liters, while the Roam 11 Hydration Pack It has clearly been developed for longer races and adventures where you need to be able to carry more independently.

So don't automatically choose the largest vest. Choose the volume that allows you to carry everything safely, without carrying unnecessary weight for miles along the trail.

Tantrums for trail running and ultrarunning

Tantrums is interesting if you look beyond just weight or liters. The brand builds gear around a simple principle: When your body and mind are struggling, your equipment shouldn't become an additional problem..

Do you run long trails, ultras, or mountain adventures and are you looking for a hydration pack that fits snugly, is practically organized, and designed for hours of use? Then Tantrums fits exactly into that segment.

Frequently Asked Questions about Tantrums

What is Tantrums?
Tantrums is an American trail running brand from Pasadena, California, that develops hydration packs and performance gear for trail runners and endurance athletes.

Is Tantrums primarily for ultrarunning?
The products are strongly geared towards long distances and endurance, but are also suitable for normal trail training and mountain days. The concept truly comes into its own, especially when stability, ample storage, and long-lasting wearing comfort become important.

Which famous ultrarunner uses Tantrums?
Rachel Entrekin is mentioned with Tantrums as equipment partner. She won the Cocodona 250 Outright in 2026 and set a new overall course record.

How many liters do I need for a trail vest?
For shorter races, less volume is usually more comfortable. For long ultras, mandatory equipment, or remote mountain trails, a larger vest, such as an 11-liter model, offers more room for food, drinks, and extra clothing.