Reddit mentions of Vaultz Mesh Storage Bags, Assorted Colors and Sizes, 4 Bags (VZ01211)

Vaultz Mesh bags
www.amazon.com/dp/B001CDD0X8/ref=cm_sw_r_cp_api_ly1kybNYBSWC7

More detail of the second pic in the link above:

• MINI wheel locks (with a socket wrench, which isn't pictured)
  
• Ice scraper
  
• A small mesh bag with a Garmin GPS and a Gerber multitool
  
• Tripp-lite power inverter
  
• Jumper cables
  
• Tow hook
  
• A "Oh Sh*t" bag that contains Mainstay Emergency Food Rations, a survival kit and a first aid kit
  
• MINI bag with a spare quart of oil
  
• A handful of bungee cords in assorted sizes
  
  I LOVE that lower compartment. So great to have all the random items I might need available, but out of the way and out of sight.

The main compartment is usually pretty easy to keep organized if you use the internal pockets. Grid It organizers are handy for smaller things like chargers and dongles, and Vaultz Mesh Pouches are handy for keeping similar items together (I like the red one for a mini first aid kit).

Vaultz Mesh Storage Bags, Assorted Colors and Sizes, 4 Bags (VZ01211)

https://www.amazon.com/dp/B001CDD0X8/ref=cm_sw_r_other_awd_L7O8wbGJHNGJ3

• Camera lenses bags. They are made for rounder profiles but they will flex around a more square object, neoprene stretches fine. Example (Although you might want to find a somewhat wider one) : http://www.dx.com/p/yy-152-waterproof-protective-neoprene-bag-pouch-for-dslr-lens-black-xl-263081 .
  
• Organizing bags.
  
• Amazon packing cubes : https://www.amazon.com/s/ref=AmazonBasics_HQP_SIM?ie=UTF8&rh=i%3Afashion-luggage%2Cn%3A15743971%2Ck%3AB014VBGE7G%7CB014VBGKFW%7CB014VBGRR8%7CB014VBGUCA%7CB014VBGP7A%7CB014VBGMX2%2Cn%3A15743971&pf_rd_m=ATVPDKIKX0DER&pf_rd_s=hero-quick-promo&pf_rd_r=13ERKJMG10EFW59CX4DW&pf_rd_t=201&pf_rd_p=2507221722&pf_rd_i=B000GGTWG6
  
• Coghlans meshbags : http://www.amazon.com/Coghlans-118-3-Count-Nylon-Organizer/dp/B000GGTWG6/ref=pd_sim_229_3?ie=UTF8&dpID=41qUrECvouL&dpSrc=sims&preST=_AC_UL160_SR99%2C160_&refRID=031ZF3YYG5VGKCJXMYY5
  
• Vaultz meshbags : http://www.amazon.com/Vaultz-Storage-Assorted-Colors-VZ01211/dp/B001CDD0X8/ref=pd_bxgy_86_img_3?ie=UTF8&refRID=0RV2BVZVZCE16K6WGQD7
  
• Etc...
  
  I am sure there are countless other options but I've used at least two of these solutions: The Vaultz meshbags and the lens cases. I have been reasonably satisfied with them.

Mesh baggies! I've been trying them out recently and they're really useful for small and medium sized things that should be kept together. I've used them for wires & charging cables & flash drives to contact cases & solution & glasses.

They come in 4 different sizes & colors and they're made out of mesh so you can see what's inside the bag.

https://www.amazon.com/Osprey-10000102-Ultralight-Stuff-Pack/dp/B0124Y2V4M?th=1&psc=1


This might be a bit too lightweight and too much like the sea to summit for you, but I really like mine. I have put about 150 miles on it in Yosemite while day hiking. I got mine off Amazon for $25. They're $35 right now for some reason. At first I was worried about the lack of a belt strap but the important thing is to keep the total weight less than 5lbs /2.5kg. Not too difficult if you frequent this subreddit.

https://www.amazon.com/gp/aw/d/B001CDD0X8/ref=mp_s_a_1_2?ie=UTF8&qid=1480966220&sr=8-2&pi=SY200_QL40&keywords=vaultz+zipper+pouch&dpPl=1&dpID=51TI5%2BeLTpL&ref=plSrch

Something like this is handy since the backpack isn't structured. I keep the weight around 2l of water and just short of 2lbs for first aid, jacket, lunch, water filter etc and have been pretty comfortable. The longest I've taken it was 22miles in a day, and while I was pretty sore, it was a good tradeoff for how lightweight I was.
I'm 5'10 140lbs,and I can see how a bigger guy would feel pretty tight in this pack though.

Maybe the AmazonBasics DSLR and Laptop Backpack? (Not an affiliate link.)

External dimensions 13.4" x 8.8" x 17.7" (LxWxH). One of the answers to a customer question says it fits under an airline seat. It has adjustable dividers for camera gear.

I haven't used it, just remember seeing it when I was looking for a camera bag, so I can't comment on the quality or performance.

Tip from an IT guy: don't worry about pockets for small accessories; pack them into little bags instead. I like the Vaultz mesh bags for my little computery gadgets and cables.