Are those BTwin bladders from Decathlon any good? £9.99 v £26.99 for a Dakine one seems like a no brainer, on the surface at least.

I’ve had a couple of them, went in to buy a cleaning kit for my decent one and decided it was cheaper to buy a couple of spares and not bother cleaning them too much.

Both still in the kit bag years later. Not an issue. Not a huge fan of the valves on them but I guess you could swap your dakine over?

What’s the filler opening like? It looks a bit fiddly from the photos.

It’s fine, twist it open and fill it. I prefer it to my hydrapack one which has one of the slidey bar style on top ones.

Decathlon do two different styles: Wide opening and Screw cap