Adidas Rucksack, Large Capacity, for Forest School/School Trip Backpack, Disaster Relief Backpack, etc. for Forest School Size: Width: Approximately 50-66 cm (Expands 8cm on each side when the hidden gussets in the side zippers are opened) Height: Approximately 48 cm Depth: Approximately 22 cm (Please note that these are approximate measurements.) Used by my two sons for forest school trips. It can hold a lot. It was spacious enough even without expanding the gussets. There are also many large pockets, making it easy to take things out. There are no noticeable stains and it's in good condition.