If your bag(s) have MOLLE straps, these things add a nice little extension beyond the main pocket to carry those items you might need in a hurry without having to dig around. Phone, power bank, pens, emergency blankets, multi-tool/knife, etc. They're small so you can't fill them with many things, but for critical items, you can do a lot worse for $10. Mine hangs right on the MOLLE strap of my car emergency bag along with the first aid kit.
Rechargeable 12V 3000MAh Lithium Battery Pack: Power Bank For LED Strip, CCTV Camera & More
43 Review
NinjaBatt High Performance Battery For Toshiba A665 And L755 Series - 6 Cells/4400MAh/48Wh
40 Review
Sennheiser HD 206 Closed-Back Over Ear Headphones - Discontinued Model
195 Review
Perixx Peripad-202H Black Wired Numeric Keypad With X-Scissor Keys, 2 USB Hubs, And Tab Key For Enhanced Productivity
44 Review