Here's a simple and effective medical pouch for your IFAK needs. Vertical orientation and MOLLE/PALS attachment.
Features two-way non-locking zippers and elastic keepers to keep the pouch ajar. Wide, horizontal elastics towards the body and vertical twin-bands of elastic on the lid.
Size: 13 x 18 x 7.5 cm (5" x 7" x 3")
PALS size requirement:
These are as new, some even in their original packaging. Made by Blackhawk! for the British armed forces. Manufactured in Vietnam.
At least for this price, these can't be beaten if you want to assemble a high-quality kit for demanding use. Availability in the future is uncertain so act now.