Reddit mentions of STANLEY STST14022 SortMaster Junior Organizer

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Here they are on Amazon. I bought mine at the local WalMart. Hold plenty of locks and are nicely stackable.

So I found this at Walmart and bought 1, then got more from Amazon and Toolbarn.

STANLEY STST14022 SortMaster Junior Organizer

Amazon Link: $8.79 includes Prime.

http://www.amazon.com/dp/B0052EEND4/

It's actually gone down in price since I've bought mine.

I have all the LEGO Dimension waves. All the characters fit in 1 case plus a couple vehicles/accessory.
Then the other vehicles/accessory go into 2 more cases. There's room to spare for Wave 4 and 5.
The cases clip on to each other and you can keep stacking them to keep them together.

Pictures here: https://imgur.com/a/ulVsO

Stanley makes different sizes of these cases but I found these ones are the best one since it fits most character's height. (some with tall weapons you have to fold down).

By far the best storage solution for someone who brings their collection on the go is the Stanley STST14027 SortMaster Tool Organizer! This case is super sturdy and durable- and each case will interlock with another, allowing you to stack them, so they won't slide around!

My Experience with these Cases
I bought 3 of these about about 6 months ago and I've been so happy- I have every figure currently out (sans Green Arrow :( ) and I've only filled 2 boxes so far- Which means I have plenty of room for next year and anticipate I won't have to buy a 4th. The case is deep enough that every figure can stand straight up without any problems - and you can fit 4 figures per-middle box with each having enough room- you could probably fit 5 but one figures disc most likely would overlap another. This style is so deep that every vehicle and items can each stand perfectly straight up- (with the exception of Nya's mech Suit, which i keep in 2 parts.)

Traveling is so Easy!
Travelling is a breeze as they stack on top of each-other and basically lock into place, the plastic is very thick and sturdy- I've dropped the case's before and the lid's stayed secured, the figures may have been shaken up- but with the dividers it's a breeze putting them back in place as each divider keeps only a small group.

How I've Organized- So far!
With 2 Boxes full - I currently have one case as my "A Team" full of my most used/needed vehicles, nearly every character (Box 2 has a few "repeat characters" I seldom play with), and all the items that are specialized and needed (I.E. Ghost Trap, Arcade Machine, Companion Cube, Sentry, Scooby Snack) I keep just a few characters in the 2nd box and use that mostly for the vehicles that I don't use.

TLDR- This case rocks
IMHO this is much nicer than those really small boxes- or even LEGO's "official storage case" for 3 of them I paid roughly 25 dollars- looks like they've gotten popular and are selling a bit higher currently at $12, so you could have a really sturdy system which holds every figure from this year and next for only 36 dollars.

https://www.amazon.com/Stanley-STST14027-SortMaster-Tool-Organizer/dp/B00O7R6RS6/ref=pd_sim_469_1?ie=UTF8&dpID=51uKQbBuFOL&dpSrc=sims&preST=_AC_UL320_SR320%2C320_&psc=1&refRID=NDC2EJ2YA01DECX13JY1

Alternative Cheaper Solution
If you want- to save money you can buy the size that has a shorter depth- but you may have figure's or vehicles who are too tall - which is why I recommend the depth of 3.4" size over this 2.6"- but you could probably buy 4 of the 2.6" for around the same cost of 3 of the 3.4 inch deep size I have. As it looks like're priced just under $10. I wouldn't recommend going any smaller- as even this size has smaller sized dividers- which may cause problems.

https://www.amazon.com/STANLEY-STST14022-SortMaster-Junior-Organizer/dp/B0052EEND4/ref=pd_sim_469_3?ie=UTF8&dpID=510DtzXeQAL&dpSrc=sims&preST=_AC_UL320_SR320%2C320_&psc=1&refRID=BWY61ZZVPD8CGSE543KM

https://smile.amazon.com/dp/B0052EEND4/ref=wl_it_dp_o_pC_nS_img?_encoding=UTF8&colid=XJRD4HE7PZC6&coliid=I3H1YNM2XUSBJH&psc=1

This is what you want. It's just tall enough for figures to stand upright inside; removable dividers make it easy to fit any vehicle; and if your collection requires more than one container, they clip together.

Someone here had recommended them a while back, but I can't seem to find the link...

I've got two and I love them.

These stack and the compartments are customizable as well as the front two compartments by the handles are the perfect size for cards.

https://www.amazon.com/STANLEY-STST14022-SortMaster-Junior-Organizer/dp/B0052EEND4/ref=sr_1_5?s=hi&ie=UTF8&qid=1466012746&sr=1-5&keywords=stanley+organizer