50 Medkits cost 12 credits in the store. It is a gigantic case filled with 50 medkits and it heals 1000 HP.
Prepare for ambushes! Heals up to 1000 HP.
It is just a way of buying medkits faster, as you need to buy 5 medkits 10 times or 20 Medkits twice to get almost as much medkits. The main point of this product is to make you spend credits and supposedly save time, since you don't have to take so much time buying stuff.