We're working out what we think - we'll add our view here!
Hydrapak says:
Take matters into your own hands with the SkyFlask™ 350ml handheld. Mile after mile, the SF350 is comfortable to hold with an adjustable hand strap. Topped with our SpeedFill™ cap that makes short work of aid station refills. Boost your performance.
We're working out what we think about Hydrapak's SkyFlask Speed 350ml, we'll add our comments here in due course.