A narrow gap beside the vanity looks like free storage until the cart’s handle hits the counter, or a caster turns sideways and catches on the baseboard. Check the route out before buying a cart for the space inside.
Measure the gap from the floor to the top shelf
Check the width at the baseboard, at the middle shelf, and just under the counter. Use the smallest number. Measure the depth to the first obstruction and check how much of the cart would stick out. If you’ll store tall bottles on top, measure their clearance too.
Make a cardboard cart
Cut a piece of cardboard to the cart’s footprint and pull it out of the gap. Can it come all the way out before hitting the door or toilet? If you have to turn it to get it past an obstacle, try that turn now. Compare the widest assembled part of the real cart, including wheels and handles, against the gap.
Two widths to compare
IKEA lists the VESKEN at 21¼ × 7⅛ × 28 inches. Consider it for a narrow, deep slot if there is room to pull it forward. The smaller RÅSKOG / NORRÅVA combination is listed at 11 × 15 × 24 inches in gray-green. It needs a wider slot but takes up less length. Check the exact variant before ordering.
If you only need two or three bottles at the front, try a narrow bin on an existing shelf first. A cart earns its space when you can actually roll it out and reach everything.
Comparison based on listed dimensions. See IKEA’s cart photos, variants, and specifications.
Recommended products
IKEA VESKEN cart, white (004.712.22)
7⅛ in. wide × 21¼ in. long × 28 in. high. For a deep slot with a clear path in front. Check the height of whatever sticks up from the top basket.