TRAIL BUM / FAB ALUULA Graflyte Backpack

TRAIL BUM
Driven by the desire to create simple, purpose-built gear and apparel, TRAIL BUM is an outdoor brand developed under the direction of Highland Design, led by Tomoyoshi Tsuchiya, a pioneer of ultralight hiking.





So Light, Yet Incredibly Tough
The body is made from ALUULA's high-density polyethylene fabric, a next-generation material with a unique construction that delivers exceptional light weight, tear strength, and waterproof performance beyond conventional nylon.

Its outstanding abrasion and impact resistance make it a dependable choice for demanding terrain, from rocky trails to dense forests. While offering the ultralight performance expected of a UL backpack, it's built to withstand serious use in the field.

The material's distinctive translucent white finish is another standout feature. With your gear faintly visible through the fabric, it's easier to locate packed items at a glance, making organization and access more intuitive on the trail.





25L as the Base, Expanding to 30L When Needed.
Offering an adjustable capacity of 25–30 L, this pack starts with a streamlined 25 L configuration that's ideal for day hikes and fastpacking. When extra space is needed, the roll-top closure and extension collar expand the capacity to approximately 30 L.

It's an excellent choice for hikers who find typical 30 L packs larger than necessary, as well as those with a shorter torso looking for a more comfortable fit. Designed around today's lighter, more compact gear, it strikes the right balance between capacity and efficiency.

Whether you're heading out on a minimalist day hike or packing carefully for a lightweight overnight trip, the pack remains light and compact while providing the storage you need.



Simple at First Glance, Full of Mountain-Ready Details.
The opening features a roll-top design. It makes capacity adjustment easy according to your load, and the rolled structure helps reduce rain from entering. The simple construction, with unnecessary parts removed, also contributes to its light weight.







The shoulder harness is designed wide, allowing it to support the load across a broader surface. Cushioned urethane foam helps reduce strain on the shoulders during long hours of carrying. Despite being a lightweight pack, its carrying comfort has been carefully considered.

It is also equipped with attachments that allow a waist belt to be added later. Being able to customize it to suit your load and hiking style is another welcome feature.



The shaped bottom panel helps keep the load positioned higher on the back, making it easier to achieve a balanced pack and enhancing stability while hiking.



The front pocket features a soft mesh selected for its UV resistance rather than stretch. Spacious enough to stash wet gear such as rainwear or a shelter, it keeps damp items separate from the rest of your pack.



Both side pockets are also made with mesh. They make it easy to see contents such as bottles, trail food, and small items, while also allowing water to drain well in rainy conditions.



The back pad is removable. You can leave it out when you want to reduce weight as much as possible, or replace it with a sleeping pad during overnight tent trips, allowing flexible adjustment to suit your style of use.