TPU inner tubes

[Dorset Boy]

I might buy some. Think they have 3 for 2 offer on.

I think it's 4 for 3

 

[Jenkins]

I thought I'd see what the fuss was about and, when bought in bulk, the Cyclami ones weren't much more than the normal budget tubes I use. If nothing else, they'll take up less space in the saddle bag as spares.