WiFi Storage for ipad for video streaming

[Pug]

Going to be doing some travelling this year with the kids, and would like to pop stuff to watch on their ipads (in the house its all streamed via plex). However they're quite full as-is, so thought about one of these wifi HDDs to copy over to en masse, for them to browse.

Thing is they all seem to have weaknesses (usually revolving around their apps).

Any recommendations?

Can you use apps like VLC to access instead?

Can you play mkv/mp4/3gp etc through the ipd with these?

 

[Peg]

I use a Hoo Too Tripmate. (Hootoo HT-TM01) I can connect any portable USB drive to it and use VLC on my iPad to play various formats (mainly MKV). I use File explorer from the app store to browse the hard drive. The Tripmate also doubles as a charger if your devices are running out of power.