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The design is simple with a single strap, and it allows entry into the bag without removing the strap.
The size is perfect for little electric mini pumps and other essentials.
Great saddlebag, holds my multitool, 3 air catridges, spare tpu innertube, 2 levers, co2 i flator head, and patch repair kit. Even has a pocket inside to store cash. Plenty of room, durable, velcro strap and zipper are strong.
Good bag
The only two things your saddle bag must do are:
1. hold the gear you need
2. stay on your bike
With respect to #1, the Signature Bag was excellent and holds plenty of stuff.
Regarding #2, this bag failed miserably, falling off mid-ride in BFE, never to be seen again (yes, it was securely fastened). Literally, in 25 years of cycling, this is the first time I've lost a saddle bag.