I bought 2 of these bags at $14.99 each based on the "mostly favorable" reviews. Here's what I found. . .
MATERIALl: Smoother, more flexible than Cordura nylon, but strong enough for my uses.
CONSTRUCTION: Appears to be double stitched around the zippers, across the PALS webbing and at the snap strap attachment points. All other seams look to be single row stitching.
The zipper heads are stamped YKK on the inside.
The PALS webbing across the front is attached slanted in relation to the bottom edge of the bag.
SIZE: These are advertised as 8" x 6" x 3". Measurements from seam to seam reveal the bags to be about 1/2" undersize in all directions, checking 7-1/2" tall x 5-1/2" wide by aprox 2-1/2" thick. I stuffed plastic shipping air "pillows" inside to fill the bags out for measurement.
I gave 4 stars because they're about what I expected at this price point, even though I had hoped for better based on the reviews.

I've had the tan one for just over a year, and now I've decided I need two. I bought the red one. Red and black sell out fast!! I use one for major trauma and stuff the second one with little stuff like bandaids, gauze, and aspirin. This is a great size. Not too big not too small. The molle attaches to my bag like cement (Maxpedition Falcon II). The snaps seem to hold up pretty well even during hikes and running. For some reason one snap always seems to unbutton every now and then but I assume that's my fault because I'm packing too much in.

Overall, this is an excellent trauma kit. It is slightly smaller than advertised, which is the only reason it doesn't get 5 stars. I have not attached it to a MOLLE rig (I keep it in my truck) but the MOLLE setup is well designed and a great idea. For the size, it is spacious enough, and allows me to keep life saving tools close at hand - I do not use this as a first aid kit (no bandaids or Tylenol in here) but rather a severe trauma kit. I have airways, chest seals, two tourniquets, trauma pads, quick clot powder and pads, and a bunch of other items which I managed to squeeze into this bag. I also have a pair of sheers which I tucked into the front MOLLE and which stays tightly attached even if the bag is dropped or thrown around. The zippers are top notch and I don't foresee any issues with them. Overall this is a great product for civilians, law enforcement, military or EMT who want to keep a small kit in their personal vehicle.

Excellent little bag,I'm very impressed how well made the bag is.I do not use the bag to hold First aid items, but instead it's a perfect little bag to hold my Clik Elite filter pouch on my camera belt.The Orca bag with the Clik filter pouch might be a little too heavy duty for some,but at least I know my $400.00 set of Lee filters are well protected when walking on trails.The zipper seem to be nice quality,and the stitching nicely done.I can see why the bag got so many good reviews-Good job Orca!

This first aid bag is great for a basic kit or a trauma kit, it is not really big enough for everything I want to have in a full first aid. I built a trauma kit inside the bag for my hunting/shooting pack along with one for every car. I have it packed very tight but it still opens easily and with quick access to all contents inside. I like this bag because
-small size.
-Molle webbing front and rear with tear away straps on rear.
-easy to spot color for first aid.
-can attach to my jeep tailgate and be easily moved to my pack or belt if needed.
I am often out in the desert shooting or hunting and am 1-2 hours from a hospital and 20-30 minutes from good enough cell signal to call for help. My setup for this pack is not for scraped knees but for someone in my party getting shot and trying to make it back to civilization before they die. figured it may help someone to have a list of what I put in mine as it took a while to narrow everything down, this is in no way a perfect list of stuff to put in but for my use it should be fine. outside my pack i have
1x sharpie marker
1x pen
1x waterproof emergency flashlight(splashflash)
1x emt shears(EMT Trauma Shears with Carabiner - Stainless Steel Bandage Scissors for Surgical, Medical & Nursing Purposes - Sharp Curved Scissor is Perfect for EMS, Doctors, Nurses, Cutting Bandages [Red])-not the best place as they get dirty but better than not having anything to cut with or looking for a knife-
1x Molle D-ring(YDO Tactical Multipurpose Grimloc Locking D-Ring for Molle Webbing 9pcs)
+Inside the pack I have
1x trauma quick clot pak-THE BEST THING TO HAVE IN ANY FIRST AID- most everything else is just supplementing this kit or giving me more of what is in it Adventure Medical Kits Professional Trauma Pak Kit with QuikClot
1x battle tourniquet (Tourniquet | Best Combat Tourniquets (CAT) | Rapid One Hand Application | Features Windlass & Time Stamp | Highest Quality Survival Gear | Perfect for Military, Hiking & Emergency Kits)
2x self adhesive bandage wraps (Ever Ready Self Adhesive Non Woven Cohesive Bandage 2"x5 Yards Pack of 12 FDA Approved)
2x 5"x9" Trauma pads(Trauma Pads, 5" x 9" COMBINE ABD (PACK OF 5))
5X 3"x4"non adherent pads GAUZE PADS NON ADHERING 3 X 4" 100/BOX"
1x Mylar blanket
3x 45cm surgical sutures
1x angled locking hemostat
1x straight locking hemostat
+Further inside the mesh back I have
1x homemade small roll of duct tape
1x 40 waterproof matches inside a snack sized ziplock
1 Quart size ziplock holding:
3x iodine vile
2x ammonia inhalant--these are in a plastic tube that used to hold gum(see photos)
2X pair of nitrile exam gloves Disposable Nitrile Exam Powder Free Gloves, 200 Count, Size Medium
2x six pack of skin closures 3M Steri-Strip reinforced Skin Closures - 1/2" x 4" - 10 pack of 6 strip envelope (60 strips)
1x small ziplock of assorted band aids ~10
1x small superglue
3x burn gel packet Pac-Kit by First Aid Only 13-010 Burn Gel Packet (Box of 6)
8x anti bacterial gel packets MEDLINE CUR001109 CUR001109Z Curad Bacitracin Ointment (Pack of 144)
4x Hydrocortisone Anti-Itch Cream Packet Pac-Kit by First Aid Only 18-012 Hydrocortisone Anti-Itch Cream Packet (Box of 12)
5x Tylenol 2pack Tylenol Extra Strength Caplets, Pouches of 2, 50 Count

This kit is addressing injuries up to getting shot, as stated above the adventure kit trauma pack is the best thing anyone can have in a first aid kit, it is basically a smaller version of what I have built here and I even include it as the first go to for major injury. the ziplocks seam silly but I purposely have things in ziplock bags for treatment of sucking chest wounds.
There are other items I would like to have such as a splint but what I have listed requres strategic placement for the bag to close correctly, even tho it is very tight the bag does open very easily and you can have anything in it in 1-2 seconds making it perfect for quick treatment. The tear away straps on the rear of the bag are also nice, they take a minute or two to mount on the tailgate of my jeep but with a firm tug on the bag it pulls out immediately and does not stag at all. The bag easily carries on a belt using the same straps and it small enough to not hinder movement or kneeling at all.