Reddit mentions of MET-Rx Big 100 Colossal Meal Replacement Bar, Super Cookie Crunch, 3 Ounce (Pack of 12)

I can't say how this compares calorie for calorie against actual 'weight gainer' products - but, Met-RX Super Cookie Crunch is the best freaking bar I've ever had. Kinda spendy, but I think you're going to be hard pressed to find a supplement option that's not.
Macros:


Nutrition| Count
---|---
Protein| 31g
Fat| 14g
Carbs| 41g
Calories| 410

IFAK - Either roll your own or buy a pre-made one.
Something like this:

http://www.chinookmed.com/cgi-bin/item/01239/LE-IFAK/-TMK-IFAK-Pouch-%26-Insert-wSOFTT-W

Or this:
https://darkangelmedical.com/product/d-a-r-k-lite-gen-2/

Meal Replacement Bars

This is my go-to. they have a long-ish shelf life and as long as the flavor has "crunch" in the name they're decent enough tasting.

http://www.amazon.com/MET-Rx-Colossal-Replacement-Cookie-Crunch/dp/B000GX4A98

Depending on where you live and how how outdoorsy you are...: This is on my short list for my Rush24.

http://www.basspro.com/Henry-US-Survival-AR7-Rifle/product/110830891883/

either that or a chiappa little badger

http://www.chiappafirearms.com/products/136

GAMES!

If you find yourself out with friends frequently I've got all of these games in the front pouch of my bag at all times.

https://boardgamegeek.com/boardgame/133473/sushi-go

https://boardgamegeek.com/boardgame/9220/saboteur

https://boardgamegeek.com/boardgame/131357/coup
With the expansion: https://boardgamegeek.com/boardgameexpansion/148931/coup-reformation

https://boardgamegeek.com/boardgame/30539/get-bit

I also have a cheapo knock around Flashlight that I need to replace... because it's crazy cheap and I burned out the O-ring that controls the "adjustable beam" functionality in like the first 5 minutes of messing with it....

http://www.amazon.com/Adjustable-Flashlight-Batteries-Included-Flashlights/dp/B005FEGYCO

I also have an Opinel #4 in the bookend pouch because why not have a backup knife... and a 250GB 2.5" usb hard drive incase i ever need to either pull down or transfer a large amount of data.

Not always in my bag but probably should be: My Olympus PEN E-PM1... takes really nice photos in my opinion and can be had for under $200... I think not having a pancake lense for it is what keeps me from throwing it in the bag and keeping it there.

Depending on if I'm actually going to be outside for a long period, or far away from home, I'll usually toss some extra socks and even a base layer in there just so I know i'll have dry clothes if I end up getting wet unexpectedly.

http://amzn.com/B000GX4A98

If you buy with subscription it comes out to about $1.75 a bar. Eat one a day for 3 weeks, I promise you will lose 20 pounds. (that's what I'm doing again right now). It'll cost you about $37 for 3 weeks worth, cheap!

(I know people will say this is unhealthy, but fasting for a short period of time is not only safe but can be healthy, just don't do this for more than a month)