A rugged, expandable, and brilliantly accessible carry-on travel backpack driven by a simple truth: No Two Trips The Same™. Features top, side, front and rear access via weatherproof #8 and #10 UltraZips, which can withstand decades of use thanks to their proprietary abrasion-resistant thread. Meets international carry-on size requirements, but expands to be a 45L gear-hauler and collapses to be a 35L day bag, making it unmatched for 1-bag travel. Quick-access pockets for keys, glasses, passport, etc. Hugely expandable side pockets for water bottles, tripods, and more. Padded laptop + tablet sleeves. Main cavity is divisible into 2 compartments via a zippered mesh sleeve. Tuck-away shoulder straps and hip belt. 360-degree grab handles. Cleverly concealed external carry straps. All packed within a sleek, weatherproof 100% recycled 400D nylon canvas shell with 900D bottom liner. Fair Trade Certified and 100% carbon neutral. External DimensionsStandard: 56cm x 33cm x 24cm (22" x 13" x 9.5")Compressed: 56cm x 33cm x 24cm (22" x 13" x 9.5") (compression only happens at the top of the bag. 6" at top when compressed)Expanded: 56cm x 33cm x 29cm (22" x 13" x 11")Internal DimensionsStandard: 53.3cm x 33cm x 16.5cm (21" x 13" x 6.5")Compressed: 53.3cm x 33cm x 14cm (21" x 13" x 5.5")Expanded: 53.3cm x 33cm x 19cm (21" x 13" x 7.5")CapacityStandard (max carry-on): 35LCompressed: 30LExpanded: 45L Laptop/Tablet CarryLaptop: 40.6cm x 30cm x 2.5cm (16" x 11" x 1")Tablet: 24cm x 19cm x 1.5cm (9.5" x 7.5" x 0.6")Weight: 2.05 kg (4.5 lb) Materials & Sustainability Weatherproof 100% recycled 400D nylon Versa Shell™ external fabric. DWR impregnated and double poly coated for water resistance. Sage fabric is Bluesign approved. 900D waterproof bottom liner High-visibility grey nylon interior Hardware is anodized aluminum and glass-reinforced nylon Super-durable UltraZips with abrasion-resistant UHMPE thread Leather accents (Sage only) are Gold Certified by the Leather Working Group Hypalon zip pulls and reinforced stress points SpecificationsWarranty: Lifetime WarrantyWeight: 4.5 lbBrand: Peak DesignLine: Peak DesignModel: BTR-45Luggage Size: BackpackWheels: Non-wheeledMaterial: NylonDimensions: 22 x 13 x 9.5 in