TRAVEL BACKPACK 45L: Built for 1-bag travel, the 45L Travel Backpack offers intuitive organization, weatherproof protection, and expandable storage – all in a clean, rugged form that adapts to your gear and destination. DESIGNED TO ADAPT: Expandable from 35L to 45L, this carry on approved pack adjusts to fit your load. Side pockets expand to hold bottles or tripods, while top, side, and rear access points keep your gear within easy reach. DURABLE DETAILS, CLEAN DESIGN: A weatherproof 400D recycled nylon canvas shell with ultra-durable hardware stands up to the rigors of travel. The burly #10 UltraZip and reinforced bottom liner add lasting durability in a sleek, minimalist silhouette. VERSATILITY FOR ANY TRIP: Tuck-away shoulder straps and hip belt allow for streamlined carry. A luggage pass-through, 360-degree handles, and hidden external carry straps make it easy to move through terminals, trains, or TSA without missing a step. RADICAL PRODUCTS, RADICAL COMPANY: Peak Design creates industry-shifting, lifetime-lasting gear with a mission to leave the world better than we found it. No investors, no venture capital – just innovation on our terms. No two trips are the same, and the Peak Design Travel Backpack 45L is built to handle them all. A larger sibling of our 30L pack, this adaptable carry-on offers more capacity, more access, and the same rugged reliability. Top, side, and full rear-panel entry points give you multiple ways to pack and grab gear on the go. A soft-lined top pocket keeps essentials like glasses, keys, and passports close at hand, while the main cavity can be divided using a zippered mesh sleeve. Inside, padded sleeves protect your laptop and tablet, and internal mesh pockets keep the rest organized. Expand from 35L to 45L when you need more room. Tuck-away shoulder straps and a stowable hip belt streamline the exterior, and a luggage pass-through makes airport transitions easy. Built with a weatherproof 100% recycled 400D nylon canvas shell and abrasion-resistant UltraZip. Works seamlessly with Peak Design Packing Cubes, Pouches, and Camera Cubes. Whether you're looking for carry on luggage or a commuter bag, this backpack adapts to how – and where – you carry.