plastic containers absorb the THC?? is there any truth to this?

[jahjahjahjah]

I use a plastic container by BIOKIPS. Its basically just tupperware. It does catch some kief with static, but you can scrape it with a metal file and collect it back.

Should I get glass or is this good?

Glass is excellent i have 1 of those to, you can go to any Colorado Shop and get em.