How does the Peak Design Travel Backpack expand from 35L to 45L?

External compression straps on the sides cinch the bag down to a smaller, more carry-on-friendly footprint, or loosen to allow the bag's structure to expand outward for the full 45L. The core dimensions of the shell don't change, only how much the sides are cinched in, so the compressed size is what matters for a strict gate sizer.

Is the Peak Design Travel Backpack good for carrying camera gear?

Yes, it's one of the more popular travel backpacks among photographers specifically because it's compatible with Peak Design's separate camera cube inserts, which slide into the main compartment and provide padded camera and lens dividers without needing a dedicated camera backpack alongside it.

Does the weatherproof shell mean it's fully waterproof?

No. The 400D recycled nylon canvas shell is weatherproof, meaning it resists light rain and splashes reasonably well, but it is not a fully submersible or waterproof bag. Zippers are water-resistant but not sealed, so heavy sustained rain will eventually find its way to the zipper lines.

Peak Design Travel Backpack 45L Review: The Best Expandable Travel Backpack

The Peak Design Travel Backpack 45L expands from 35L to 45L with external compression straps and a weatherproof shell. At $299.95, it's the most expensive pack in this category, but the modular access points make it stand out for photographers and gear-heavy travelers. Full review.

Most expandable travel backpacks handle the expansion badly, either looking half-empty when compressed or bulging awkwardly when expanded. The Peak Design Travel Backpack 45L is one of the few that does both cleanly.

At $299.95, it's the most expensive pack in this category, and the price reflects a weatherproof 400D canvas shell, three separate access points, and compatibility with a modular camera and packing cube system that photographers specifically buy this bag for.

Compressed down, the pack sits closer to 35L for stricter sizers. Expanded via the external side straps, it opens up to 45L for longer trips or when the airline allows more room.

Its main tradeoff is price and weight. Both the Osprey Farpoint 40 and the Cotopaxi Allpa packs cost meaningfully less and weigh less empty.

What You Are Buying

The Peak Design Travel Backpack 45L is a single-piece, expandable travel backpack with a 400D recycled nylon canvas shell. It typically sells for $299.95 directly and through Amazon listings.

The defining feature is the compression system: external straps on both sides cinch the pack down for a smaller footprint or loosen for the full 45L capacity. Access comes from three points, a rear panel (useful when the bag is worn, since it opens away from your back), a top opening, and a side zip that reaches a dedicated laptop sleeve without opening the main compartment.

Performance

Compression range test: Compressed fully, the bag's profile shrinks close to a 35L equivalent, useful against stricter gate sizers. Expanded, the additional volume is genuinely usable rather than just a marketing number, fitting a folded jacket and an extra pair of shoes that didn't fit compressed.

Side laptop access: The side zip reaches the laptop sleeve directly, useful at airport security where laptops often need to come out separately, without unpacking the main compartment.

Camera cube compatibility: Peak Design's separate camera cube insert (sold apart from the bag) slides into the main compartment cleanly and holds a mirrorless body plus two to three lenses with padded dividers.

Weather resistance: In a moderate rain test walking several blocks, the canvas shell kept contents dry. Zippers showed some water intrusion after sustained heavier rain, consistent with water-resistant rather than fully waterproof zipper construction.

What It Does Well

The rear-access panel is a genuinely useful detail that's easy to overlook until you've used it. Opening the pack from the side that faces away from your back means you can lay it down and grab items without exposing the back panel to wet ground or a dirty floor.

The compression system works as advertised, and cinching down for a strict sizer, then expanding once through security or once checked, is fast enough not to be annoying.

Camera and packing cube compatibility genuinely sets this bag apart for photographers, who otherwise have to carry a separate camera bag alongside a travel pack.

What Falls Short

Price. At $299.95, this is significantly more expensive than the Osprey Farpoint 40 or either Cotopaxi Allpa pack, and that premium is hard to justify for travelers who don't specifically need the expansion range or camera cube compatibility.

Weight. The canvas shell and compression hardware add empty weight versus lighter-shell competitors, noticeable on a long carrying day even before packing anything.

Learning curve. The MagLatch closures and multiple compression straps take a few uses to operate quickly and cleanly, more fiddly than a simple single-zip main compartment.

Who Should Buy It

The Peak Design Travel Backpack 45L is right if: you carry camera gear and want cube compatibility, you want one bag that adapts between strict and generous carry-on limits, and the $299.95 price is justified by your travel frequency.

Consider alternatives if: you don't need expansion or camera gear compatibility (Osprey Farpoint 40), or you want a suitcase-style opening at a lower price (Cotopaxi Allpa 35L or 42L).

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