This premium-quality amp bags allows you to transport your Markbass head in a knapsack along with cables, charts, etc. Ultra-handy for in-town gear transport. MARKWORLD BAG LARGE fits the MB STU AMP 1000, MARKBASS EVO 1 / DV MARK EVO 1 and the following discontinued Markbass heads: SA 450, SD 800, SD 1200, TA 501, TA 503, R 500, TSA 500, Studio Pre, Studio Pre 500.