Bonfus Aerus 55L Ultimate Lightweight Backpack for Long-Distance Hiking and Backpacking

Bonfus Aerus 55L Ultra200X Product Introduction 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