I have tried on and would like to purchase the Osprey Aether 70 in a large size. In our local REI store I did a fit test of this pack in January. The REI employee was very helpful and found the large pack was the correct size but I would benefit from medium hip belt and harness. They told me they could change it out in the store when I bought it. Now the stores are closed. I would like to order this pack online, it is in my ‘cart’ but I am not sure if the central supply would switch out the straps or send the medium ones to me. Is that possible?