Duncan Murrell / Almaciga seedlings (Agathis philippinensis), in traditional rattan backpacks near Sitio Tagnaya for replanting in Cleopatras Needle Critical Habitat, Palawan, the Philippines.

Duncan Murrell / Batak men carrying traditional rattan backpacks crossing a river on an Almaciga tree (Agathis philippinensis) cone collecting expedition in Cleopatra's Needle Critical Habitat, Palawan, the Philip...

Duncan Murrell / Batak men carrying traditional rattan backpacks crossing a river on an Alamaciga tree +Agathis philippinensis) cone collecting expedition in Cleopatra's Needle Critical Habitat, Palawan, the Phili...

Tim Laman / Family hiking with backpacks through Acadia National Park, Maine, USA. October 2013. Model released.

Tim Laman / Boy and girl hiking with backpacks through Acadia National Park, Maine, USA. October 2013. Model released.

Kirkendall-Spring / Backpacks at Constance Pass in Olympic National Park. Washington, USA. August 2017.

SCOTLAND: The Big Picture / Group of hikers with backpacks for overnight camping, Cairngorms National Park, Scotland, UK, February 2016.

Kirkendall-Spring / Woman hiking through fallen trees on Quinault River Trail, Olympic National Park, Washington, USA. Model released.

Merryn Thomas / Men walking on beach at Aberdovey, West Wales, January 2015.

Nick Turner / Family walking on Selsley Common on the Cotswold Way, Gloucestershire, UK. August 2012.

Steven Kazlowski / Woman hiker with tired puppy in a backpack, Mount Townsend, northwest Olympic National Park, Olympic Peninsula, Washington, USA. November 2013. Model released.

Steven Kazlowski / Tired puppy asleep in a backpack, Mount Townsend, northwest Olympic National Park, Olympic Peninsula, Washington, USA. November 2013

Steven Kazlowski / Woman hiker with tired puppy in a backpack, Mount Townsend, northwest Olympic National Park, Olympic Peninsula, Washington, USA. November 2013. Model released.

Oriol Alamany / Two hikers with backpacks walking through the old-growth forest of Carmanah-Walbran Provincial Park, Vancouver Island, British Columbia, Canada

Oriol Alamany / Hiking boots and backpacks at the entrance of Grey mountain hut, trekking in National Park Torres del Paine, Patagonia, Chile

Nick Turner / Walkers carrying backpacks on the Cotswold Way National Trail at Painswick, Gloucestershire, UK, May 2008.

Bryan and Cherry Alexander / Park warden on patrol at Tanquary Fiord. Ellesmere Island, National Park Reserve, Canada, 1994.

Jerry Monkman / Mothers taking their babies for a hike through the forest near Meadow Pond, Stephenson's Way, Groveland, Massachusetts, USA

Nick Turner / Walkers carrying backpacks hiking above Llyn y Fan Fach, a glacial cirque, beneath Black Mountain in the Brecon Beacons National Park, Powys, Wales

Nick Turner / Walkers carrying backpacks above Llyn y Fan Fach, a glacial cirque, beneath Black Mountain in the Brecon Beacons National Park, Powys, Wales

Fabio Liverani / Hikers with backpacks walking through rocky landscape, Sardinia, Italy

Tim Laman / Porters carrying gear and tripod bags in rattan basket backpacks whilst hiking to hornbill research camp, Gunung Nyiut Nature Reserve, Kalimantan, Borneo.

Tim Laman / Porters carrying gear and tripod bags in rattan basket backpacks across river whilst hiking into hornbill research camp, Gunung Nyiut Nature Reserve, Kalimantan, Borneo. March, 2018.

Tim Laman / Porters carrying gear and tripod bags in rattan basket backpacks, whilst hiking to hornbill research camp, Gunung Nyiut Nature Reserve, Kalimantan, Borneo.

Eric Baccega / French tourists who love Giant pandas (Ailuropoda melanoleuca) with panda T-shirts, facemasks, caps and backpacks. Beauval ZooParc, Saint-Aignan, France. Model released. August 2021. Editorial use onl...

Eric Baccega / French tourists who love Giant pandas (Ailuropoda melanoleuca) with panda T-shirts, facemasks, caps and backpacks. Beauval ZooParc, Saint-Aignan, France. Model released. August 2021. Editorial use onl...

Eric Baccega / French tourists and panda fans watching Giant panda (Ailuropoda melanoleuca), with panda T-shirts, facemasks, caps and backpacks. Beauval ZooParc, Saint-Aignan, France. Model released. August 2021. Ed...

Philippe Clement / Four mountain climbers silhouetted against Torre dei Scarperi / Schwabenalpenkopf, Sexten Dolomites, Parco Naturale Tre Cime, South Tyrol, Italy, October 2019

Philippe Clement / Mountain walkers silhouetted against Torre dei Scarperi / Schwabenalpenkopf, Sexten Dolomites, Parco Naturale Tre Cime, South Tyrol, Italy, October 2019

Philippe Clement / Two mountain walkers silhouetted against Torre dei Scarperi / Schwabenalpenkopf, Sexten Dolomites, Parco Naturale Tre Cime, South Tyrol, Italy, October 2019