If you are wondering what the differences are between these two packs you came to the right place. Let's start with specifications as provided by Osprey:

	Ellipse [amazon-element asin="B00IMXP6I8" fields="button,new-price"]	Flare [amazon-element asin="B00IN0WCD2" fields="button,new-price"]
Volume	25 liters (1526 cu.in.)	22 liters (1343 cu.in.)
Weight	1 lb 6.9 oz (0.65 kg)	1 lb 9 oz (0.72 kg)

The weight of each bag is as advertised. However, I am not sure why Osprey lists a 3 liter volume difference between the two as the dimensions are identical. Exterior of the bags are very similar. Although they both have a pouch on each side, Flare has one additional pouch on the front. Ellipse has a strap in its place. Similarly, interior of bags are nearly identical too. There is a front and a main compartment in each bag. There is also a smaller zippered pocket just outside of the front compartment. The only difference within the front compartments is that Flare has a zippered interior pocket whereas Ellipse uses a small velcro strip for the same pocket. Likewise, main compartments have identical layouts. However, Flare has an additional zippered pocket. In addition, Flare's laptop/tablet padding is thicker than Ellipse's. Finally, both bags have a small opening hidden under the top handle loop that can be used for a hydration bladder or a set of ear phones for media players. In sum, these two bags are nearly identical in dimensions, layout and price. The differences are two zippered interior pockets, an exterior front pouch and a thicker padded compartment on Flare.

Osprey Flare & Ellipse Comparison Photos

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[AMAZONPRODUCTS asin=B00IMXP6I8] [AMAZONPRODUCTS asin=B00IN0WCD2]