
Two velcro-type straps (one of which can be re-located in different positions) near the top of the bag for attaching to stem & handlebar a web strap at the base which can be attached to whatever is convenient (usually the head tube on a road bike)to provide stability.
Elastic cord to closeopen the top - simple to operate on-the-go.
Does not hold a huge amount - I use two (I find difficulty in accessing all the rear pockets of jersey on-the-go as advancing age is perhaps limiting right arm flexibility),
Works well from my perspective (but do not have experience with any other brands) - marked down to 4-stars for value as shipping to Canadian address is expensive