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These attach perfectly to wald baskets and cost £7 - i've got 2 of them and great for tools/ cooking gear
similar to this - but much much cheaper
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These are a great shout, and probably better than a standard bottle holder for my uses (keeping a little point and shoot camera in it)
Also whilst I’m in the Molle/military bag rabbit hole, these look like they’d make an alright bar bag (albeit maybe a little too long maybe for smaller bars).
If you want cheap bottle holders, there's loads of Molle stuff out there that works for bikes. Thye come in all the classic prepper colours.
https://www.kombatuk.com/categories/2016-Large_Dump_Pouch_-_Coyote
https://www.amazon.co.uk/Yakmoo-Tactical-Military-Waterproof-Outdoors/dp/B07PT4Z8YV/ref=sr_1_12?dchild=1&keywords=molle+bottle+holder&qid=1597741506&sr=8-12