I've had a rec from someone else for this one: https://www.camelbak.co.uk/packs-c36/bike-c50/hydrobak-light-hydration-pack-2-5l-with-1-5l-reservoir-p35 someone else uses it on road and says it was well ventilated and he preferred not having anything on his waist.
^^ that Camelbak is £43 quid in Halfords (+some workplace discount schemes might get an additional 10% off - mine does)
https://www.halfords.com/cycling/bike-accessories/bike-hydration-packs/camelbak-hydrobak-light-1.5l-plus-1.5-litre2f50oz-459454.html?cmmmc=Google+PLA--Cycling%3EBike+Accessories%3EBike+Hydration+Packs--Cycling%3EBike+Accessories%3EBike+Hydration+Packs--459454&_$ja=tsid:|cid:18239999750|agid:|tid:|crid:|nw:x|rnd:11044860905236797178|dvc:c|adp:|mt:|loc:9044886&gclid=EAIaIQobChMI6r7C4ZXAgAMVolNBAh2WWA2cEAQYAiABEgIZwfD_BwE
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I've had a rec from someone else for this one:
https://www.camelbak.co.uk/packs-c36/bike-c50/hydrobak-light-hydration-pack-2-5l-with-1-5l-reservoir-p35
someone else uses it on road and says it was well ventilated and he preferred not having anything on his waist.