Peak Design BTR-45-BK-1 outdoor backpack 45 L Black Unisex Nylon

The Peak Design BTR-45-BK-1 is a versatile, weatherproof carry-on backpack designed for one-bag travel and outdoor use. In its default configuration it meets international carry-on size limits as a 35L pack, expands to 45L via dual expansion zips, and compresses to about 30L for day-to-day use. Constructed from 100% recycled 400D nylon canvas with a rugged 900D weatherproof bottom liner, the pack includes weatherproof, lockable oversized zippers and an interior PU-coated lining for rain protection. The backpack features multiple access points (top, side, front and rear), tuck-away shoulder straps and hip belt with magnetic catches, 360-degree grab handles, and numerous internal and external pockets including a divisional zippered mesh sleeve.

Advantages

The design balances capacity, protection, and organization: expandable volume up to 45L, firm structure that keeps the bag upright when packed or empty, and a network of pockets and zippered panels for organized storage. Weatherproof materials, oversized lockable zippers, and PU-coated interior provide reliable protection for gear. Tuck-away straps and magnetic closures simplify airline check and storage, while multiple access points enable quick retrieval of equipment including laptops and camera cubes.

Suitable for

• Carry-on travel and one-bag trips
• Outdoor day hikes and overnight trips
• Photography, drone, or video gear transport (with separately sold camera cubes)
• Commuting with laptop or tablet

Key specifications

• Model: Peak Design BTR-45-BK-1
• Capacity: 35 L (default) — expands to 45 L; compresses to ~30 L
• Material: 100% recycled 400D nylon canvas shell; PU-coated interior; 900D weatherproof bottom liner
• Access: top, side, front and rear zippers; rear main zip for laptop/tablet
• Weight: 2.15 kg
• Dimensions: width 150 mm (manufacturer data)
• Closure: weatherproof oversized #10 front and #8 back zippers (lockable)

How to use

Use the backpack in its 35L configuration to meet most international carry-on limits; unzip the dual expansion zippers to increase capacity to 45L for additional gear. Compress the bag using the compression snaps when you require a smaller daypack. Access items quickly through the top, side, front or rear zippers; the rear main zip provides direct access to tablet and laptop sleeves. Store camera cubes or packing tools inside the main cavity; tuck away shoulder straps and the hip belt into their magnetic pouches when checking the bag or storing it to keep straps secure.

Usage recommendations

To protect electronics and sensitive gear, use the rear laptop/tablet access for quick removal at security checkpoints and consider separately sold camera cubes or packing tools to organize and cushion cameras, lenses, and accessories. Wipe the exterior after exposure to heavy rain and avoid prolonged submersion despite the weatherproof materials.