I haven’t used a Gila, but it uses the same suspension as my Unaweep 4800, so take this with a grain of salt: The Flight is about a pound lighter than the Gila and probably slightly smaller in volume. The Gila frame and suspension is built for heavy loads – Its the same that’s on the 6300ci Unaweep for example and it was designed for massive loads like elk quarters. The frame and suspension is probably the most comfortable I’ve ever used and is great for expedition style trips where you’re carrying two weeks of food, or for packrafting trips where you have the extra weight of packrafting equipment. It’s also great for the more traditional or semi lightweight backpacker that might carry 30-35lbs for a week long trip, but <span style=”display: inline !important; float: none; background-color: transparent; color: #333333; font-family: sans-serif; font-size: 14px; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;”>It’s completely overkill for loads under 30lbs, and for me that means for a trip like a week in the Sierra, where my load is probably 25-26lb even with a bear can and microspikes, something like the Flight makes more sense. </span>
The Gila itself to me is an unusual pack, in that it’s capable of carrying heavy loads, but it’s not that large of volume. I know for myself at least, if I need to carry 30+ pounds, I need larger volume pack than the Gila. The Divide, which is a 1000ci larger makes more since to me on that frame. The frame itself is wider and though it is actually quite nimble for what it is, it’s not as nimble as the Flight.
The Flight has a tapered bottom so it works well for moving over, scooting across, etc talus and other moves you might encounter in Class 2 and Class 3 off trail travel. Those same moves would probably scrape the bottom of the frame on a Gila (my Unaweep has some scratches from this) and not that this hurts anything, it’s probably stretching it’s use a bit.
My take is (and I tend to be very conservative compared to most people) the Flight would be good to the low to mid 30lb range. The frame, which seemed very robust could probably handle more, but I think the hipbelt would start to sag by then. The Gila (and Divide/Unaweep) could easily go 50-60lbs or more. The suspension is quite capable. I think they rate it to around 100lbs, and I have no doubt the frame would do it. I’m not what weight the hipbelt would begin to sag at, but honestly probably more weight than the rest of my body could carry, and at significantly more weight than anyone on here would ever carry (except for Tipi on one of his 24 day trips).