Ugreen USB-C to USB-A Adapter
I bought the Ugreen USB-C to USB-A Adapter on Lazada's 8/8 sale for S$3.99, below its S$5.39 retail. This USB 3.1 Gen 1 OTG adapter hits 5Gbps and comes with a keychain strap.
USB 3.1
USB 3.1 adapters and drives.
SanDisk Ultra Dual Drive Go
The SanDisk Ultra Dual Drive Go is a flash drive with both USB-A and USB-C connectors, bridging older and newer devices. On USB 3.1 Gen 1 it reads up to 150MB/s, in capacities from 32GB to 512GB.
Elecom USB-C to USB-C Power Delivery Cable
I bought two Elecom USB-C to USB-C Power Delivery cables from Yodobashi Sapporo, only to realise they're from different series despite looking identical. Per Benson Leung, the USB3-CC5P supports 100W (5A), while the USB3-CCP supports 60W (3A).