FYI, the £15 'binlun' fake-Erika straps off amazon are that little bit better quality than the cheap aliexpress ones, despite them looking identical. The elastic is a little bit better quality, as is the hardware, which has a nicer finish and a more thoughtful clasp design.
Edit: AliExpress on left, binlun on right, which also has teeth on the central bar so it slips less.
FYI, the £15 'binlun' fake-Erika straps off amazon are that little bit better quality than the cheap aliexpress ones, despite them looking identical. The elastic is a little bit better quality, as is the hardware, which has a nicer finish and a more thoughtful clasp design.
Edit: AliExpress on left, binlun on right, which also has teeth on the central bar so it slips less.