Exactly as it says on the tin. There's a bunch of merchandise with SCP/Containment Breach logos/arts slapped on them - backpacks, wallets, baseball caps, tshirts etc. All without proper attribution-sharealike. Mainly from companies whose business strategy is "let's slap logos from Star Wars/Disney/Marvel/whatever on cheap tshirts, without asking for permission", so no idea how receptive they'll be to attempts to contact them. Oh well.
In any case, here's a decidedly non-comprehensive list of examples. Will update this tomorrow when I'm less sleepy: