Okay, I'll probably tweak some noses here, especially after several people I respect have already posted their preference for these cases. I mean no disrespect.
Exactly what items in your fire kit require it to be crushproof and waterproof? Will choosing a rigid container increase the liklihood that the kit will be left behind on "fast & light" dayhikes and such? I think these cases are more appropriately suited for delicate electronics. If your fire kit components are so delicate and vulnerable to the elements, perhaps they aren't the best choices for the field.
I don't carry a dedicated fire kit, but prefer a small nylon pouch that I don't overfill for my PSK. I appreciate the bombproof nature of a lot of rigid containers, and seem to have an obsessive urge to collect them, but I generally can't justify the added weight and rigidity.
Lately I've been really focused on having the "essentials" on my person, rather than stuffed in my pack. As such, I've been paring my PSK down. (That doesn't me an that there isn't additional stuff in my pack!) There is no way I want a rigid case in my cargo pocket!
-- FLIX

me nose got tweaked!
why do i need waterproof? well, there's an old saying from the civil war: "keep yer powder dry men"! I live in one of the wettest areas of Canada, its not uncommon to have pack or pocket contents soaked from rain or river crossings. Having it in a Pelican 1010 case guarantees it will stay dry. Especially my esbit tabs (for heating my cuppa tea). Put an esbit tab in water or get it damp and see how useless it becomes very quickly. See how useless PJCB comes when exposed to vancouver rain. see how useless fatwood shavings get when exposed to vancouver rain. see how useless cattail fluff becomes when exposed to vancouver rain......etc etc etc etc. Keep yer tinder dry! keep your matches dry! keep your esbit dry!
as for crushproof, thats just a bonus of the case. I just like bombproof gear. It also floats and will not sink........try sending your leather pouches down a river and see how long they stay on the surface or how well they last or stay dry (if you ever find them again) . My 1010 case will bob around and float ON the surface, and will NOT get impacted or damaged by rapids or contact with boulders - plus the bright yellow color is easy to spot. Does this kind of event happen often? no, but i'm prepared for it if it does. I have tried the Aloksaks but my experience with Aloksaks has NOT been positive. They are great for FAK kits but after several openings and closings they start leaking at the seal. Bend them or fold them and they weaken quickly. Add in firesteels and scrapers and the materal gets compromised quickly. (my experience - YMMV). I prefer a hardcase. I use Peli cases for everything, jobsite tools, truck kit, FAK, tool kit, camp kithcen kit, gear transport, gear storage. Love em. Its also easy to color code things. Hey joe, grab the yellow box, hey joe grab the clear box, hey joe grab the black box...etc etc. Drop your leather or nylon pouch in the woods and try and find it........ a hard case in bright safety yellow or orage or blue stands out like a beacon. The Peli 101 case also fits PERFECTLY in many of my gear bags small pockets, or in my SAS smock radio pocket or in the cargo pocket, i dont even notice it. It can be used as a throw line weight, I can tuck a letter into it and tie it to a tree, guaranteeing it will stay dry for the recieving person to find and read. Many uses.
as for "fast and light", i have a Micro Peli "clone" case the size of a half pack of smokes, slips into a pocket, dont even notice it. I'm also in the process of developing a wearable vest, based on the Delta5 platform with integrated water unit, that will have 4 Pelican 1030 cases Attached to the PALS rails. Hardshell gear. Pop open a case, grab gear, shut case.
again, my experience, ymmv.