The Aerus 55L is Bonfus' ultimate lightweight backpack designed for thru-hikers and backpackers. Its main feature is a curved frame with a breathable mesh back panel, which effectively reduces the contact area with the back, mitigating discomfort from sweating in hot weather and managing moisture to prevent chills in cold environments .
This backpack is made from ultra-lightweight and durable fabric, with taped seams to further enhance its waterproof performance . Featuring an adjustable curved frame, tensioned mesh back panel, large side pockets, spider buckle compression straps, and an advanced frame-to-hip-belt weight transfer system, the Aerus 55L strikes an excellent balance between storage flexibility, ergonomic comfort, and off-road performance .
Features
Description
Curved Frame & Ventilated Back Panel
Curved tensioned mesh back panel creates a breathable gap between your back and the pack, reducing contact area; frame anchor points are specially designed to minimize horizontal sway and conform to shoulder curves to distribute pressure points
Thickened Hip Belt
Extra 8mm foam padding on the hip belt, paired with 38mm wide webbing, provides a secure and supportive fit
Adjustable Mesh Tension
The rigidity of the mesh panel can be adjusted at its connection to the hip belt for optimal comfort and fit
Shoulder Strap Design
Lined with 7/16" EVA foam, combined with breathable 3D air mesh fabric; the neck area also uses 3D mesh for enhanced comfort
Large Front Mesh Pocket
Triangular elastic mesh pocket with adjustable webbing for securing larger gear such as sleeping pads
Two Large Side Pockets
Can hold two water bottles or other personal items
Roll-Top Closure + Y-Strap
Roll-top closure design with an extended Y-strap for securing bulky gear
Side Compression System
Spider buckle compression straps for quickly and securely attaching items to the side of the pack
Ice Axe Loops
Ice axe/trekking pole attachment loops at the bottom
Taped Seams
Enhances overall waterproof performance
Self-Assembly Required
Due to the shipping volume of the curved frame, Aerus backpacks may arrive unassembled, requiring you to insert the aluminum stays and carbon fiber crossbar yourself (assembly instructions and video included)
Specifications
Item
Specification
Total Capacity
55 Liters
Main Compartment Capacity
48 Liters
External Pocket Capacity
8 Liters
Number of External Pockets
3
Recommended Max Load
18 kg / 40 lbs
Dimensions (Unrolled)
Height 87 cm x Circumference 96 cm
Weight
Size M approx. 795 grams
Size Adjustment Impact
Size S approx. -10g / Size L approx. +10g
Origin
Mexico
Size Chart
Size
Torso Length
Waist Circumference (Hip Belt)
S
Max 18 in / 45 cm
75 - 100 cm
M
Max 19.5 in / 50 cm
84 - 110 cm
L
Max 22 in / 56 cm
84 - 110 cm
Material Composition
Part
Material
Main Body
Ultra200X™: 168gsm, 400D UHMWPE fiber weave, lined with 0.75mil recycled polyester film (66% 200D UHMWPE + 34% recycled polyester)
Shoulder Straps / Side Pockets / Hip Belt
Stretch mesh (nylon and elastane blend), 3D air mesh, EVA foam
