I think Loewe’s Puzzle Bag is the main influence here. The box shape is practical and distinctive, especially worn across the body. It looks like you're carrying a Box Brownie camera, while in fact the box shape is useful for your phone charger and any other bits you want to carry.
For the cash option, I recently discovered Indian brand, Nappa Dori, stumbling across their store in Covent Garden. The Nappa Dori name literally translated means 'leather and thread’ in Urdu. Founded in 2010 in Delhi by Gautam Sinha, a NIFT (National Institute of Fashion Technology, Delhi) graduate in Fashion Design, he had an epiphany that compelled him to discard conventional fashion design and explore the world of Indian leather and artisanal craftsmanship.
Left & Right - Nappa Dori - Nordic Brick Bag - £181.10
Nappa Dori supports Harmony House, a day shelter for destitute children in India that provides free food, shelter, clothing, education and medical care to the under privileged. As well as the flagship store in London, they are seven stores in India spread across Delhi, Gurgaon & Bombay.
While for the cash option, designer, Eudon Choi, has this square bag with a similar handle to the Puzzle in this handsome green colour.
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Below - Eudon Choi - Cardena Dark Green Leather Box Bag - £385 from Harvey Nichols