A $299.95 backpack that zips from 35 liters to 45 liters on a single strap claims to cover a camera-heavy work trip and a beach weekend without swapping bags. We tested the expansion, the camera cube fit and the 4.5-pound base weight to see if that holds up.
The expansion zipper genuinely turns one bag into two sizes, and the build quality backs up the lifetime warranty, but 4.5 pounds empty and a premium price mean this is a bag for people who value structure over saving grams.
Best for Photographers and gear-carrying travelers who need one bag to flex between a work trip and a lighter weekend
Two trips, one bag: a five-day work trip hauling two camera bodies and a laptop, then a beach weekend needing nothing but shorts and a towel. Peak Design's Travel Backpack claims a single zipper handles both, and we packed it for exactly that comparison.
Compressed, the bag sits at 35 liters. Pull the external zipper and buckle the strap on each side, and it opens to 45 liters, adding roughly a laptop bag's worth of room without unpacking anything already inside. For the camera trip, we left it compressed and let the internal structure hold two bodies and three lenses upright. For the beach weekend, we expanded it fully and fit a week of clothes, sandals and a paperback with room left for souvenirs.
The mechanism itself never jammed or needed force, a small detail that matters more once you have fought a stuck expansion zipper on a cheaper bag in an airport line.
Peak Design sells Camera Cubes separately, and once one is zipped into the main compartment, half the bag becomes padded, configurable gear storage while the rest stays open for clothes. That flexibility is the backpack's real selling point for photographers: one bag replaces both a camera backpack and a travel duffel, at the cost of losing some front-panel pocket space to the cube's bulk.
Non-photographers get less obvious benefit from this design, since the price partly reflects hardware most travelers will never install.
At 4.5 pounds empty, this bag is noticeably heavier than most 40 to 45 liter travel packs, some running a full pound lighter. Independent lab testing at OutdoorGearLab confirmed the same gap against competitors, attributing it to the 400D weatherproof canvas and the internal frame that keeps the bag structured even half-empty. That structure is exactly what makes camera gear ride safely, so the extra weight is a direct tradeoff for protection, not wasted material.
We caught two unplanned downpours during testing, one waiting for a bus, one walking between hotels. Both times, the 400D nylon canvas beaded water rather than soaking through, and the laptop compartment stayed dry both times. That is not a guarantee against a full submersion, but for the kind of weather most trips actually throw at a bag, it performed better than most non-weatherproof packs at this size.
Fully expanded to 45 liters, the bag's dimensions creep close to the limits some budget airlines enforce for carry-ons, particularly in Europe and parts of Asia. Travelers flying those routes should check their specific airline's size chart before relying on the expanded capacity, since a gate agent measuring a fully stuffed bag is not going to care that it compresses back down.
The rear laptop compartment fits up to a 16-inch machine and opens independently of the main pack, useful for airport security lines where you need the laptop out without unzipping everything else. Side access zippers reach into the main compartment from either hip, letting you grab a jacket or a charger cable without setting the bag down and digging through the top. Small touches like these add up over a long trip, even if none of them alone would justify the price on its own.
This bag makes the most sense for someone who genuinely needs both modes: full camera protection on some trips, lighter packing on others, in the same shell. A traveler who never carries fragile gear and just wants the lightest 40-liter pack available will find better value, and lower weight, elsewhere.
Away from the airport, the bag doubles as an everyday carry pack, and the hip belt tucks into a hidden pocket when you don't need it for a heavy load. Switchback's long-term testers found the shoulder straps stayed comfortable even loaded with a laptop and a full Camera Cube for a full day of walking, which matched what we felt on a day trip carrying both bodies and a change of clothes between train stations.
The expansion zipper is not a gimmick: it turns one bag into two real sizes without compromising either, and the build quality justifies a lifetime warranty rather than just gesturing at one. The 4.5-pound base weight and premium price are the real cost of that flexibility, and they are worth paying only if you actually use both sides of what this bag offers.
Best for travelers doing multi-city trips with stairs, cobblestones, or unpaved ground between stops.
$200
Best for travelers who genuinely switch between backpack and duffel mid-trip and don't mind extra bulk for the flexibility.
$329.99