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This one? Have you used it on its own? the blurb talks about limitations...
Note: This Airlok will fit perfectly inside one of our Koala seat packs. If you want the lightest possible set up it is also possible to attach it directly to the seat post as a lightweight saddle bag. However be aware of its limitations: sitting underneath your seat it will be exposed to constant abrasion, mud and grit which may eventually wear holes in the fabric. Other options include systems such as the WildCat Tiger padded harness.
@Gaston_Fr buy it direct form the the link above.
Wow $$$ thanks Skinny