Man, where do I start?!
This hydration pack.... is GODDAMN AMAZING! From construction, to features, to operation, this hydration pack is magnificent. To begin, this hydration pack is obviously both a pouch and hydration carrier all in one. The hydration bladder is contained in a small pocket of space between the pad for your back and the pack itself. It is constrained by a high-quality Velcro patch that isn't coming undone unless you open it yourself. The bladder is pretty nice, though I thought the materials that it is made out of were a little thin - but that's not a problem. The tube for the bladder is then run through to the backpack straps, so it stays within use or reach without any issues. The straps also have MOLLE connectors on them and a QD buckle to hold them on you.
The pack also has plenty of space. There are two pockets on the bottom sides that I found to be easily reached if you need batteries or small attachments. The main pouch has PLENTY of space for any airsofter. I actually use this for school sometimes, and it holds three notebooks, a 1,500 page textbook, and a pair of over-the-head headphones. There's also another small pocket on the top that I hold iron sights or other small parts in.
When it comes to operation, this pack is as light as you want it to be. Empty, you wouldn't even notice this thing on your back. The hydration pouch and hose work perfectly, and the pack stays stable. I run it over a plate carrier and it works fine.
Plenty of pockets
A lot of internal space
MOLLE connections for extra storage
Lightweight and small
None, this pack is all around amazing! Why don't you own one already?