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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@Scrabble
I've got a thermarest venture. About 500g, cost about 50 quid but it's so comfy I use it as a spare mattress at home. Packs pretty small. Seems to be quite robust too. The further up the lightness scale you go, the more fragile they look.