Markins TB-30 brand_K&F Concept very dependent on which laptop

very dependent on which laptop you've got: Peak Design says 1

Interior dimensions are approximately 12x20x39cm

and light weatherproofing

There's no measuring or portioning

the focus distance window has been replaced with a LCD display that can be switched between several modes- it might come in handy

Markins TB-30 brand_K&F Concept very dependent on which laptopThe Markins TB 30 is a head base for select Gitzo Series 3 tripods which replaces the centre column with a fixed plate for additional stability. Includes plate, stem bolt, and extension tube. The tube lets you connect your tripod's hook, but the plate can be installed without the extension tube & hook with the addition of a 3 8" nut (not included). Fits G1320, G1326, G1327, G3330, G3530, G3540 3540L tripods, as well as G3531, G3541, and G3541L models