Shopping for an under sink organizer when a P-trap runs through the cabinet is a different problem from ordinary shelving. The pipe sits low, sits central, and doesn't move. Most racks are designed for an empty box, so they fail here. These are the features that decide whether a unit works around plumbing.
Adjustable shelf height, not just adjustable width
Plenty of organizers expand sideways. Fewer let you raise or lower the shelf, and that's the axis the trap occupies. You want to set the shelf above the pipe's curve on the tight side and lower on the open side. A fixed shelf gives you one chance to be lucky.
Legs that land in the open zones
Check where the unit's feet sit. If the frame requires a continuous flat footprint across the cabinet, a leg will end up on or against the trap. Units built as two independent halves are much easier to place, because each half can stand in its own lane beside the pipe.
Pull-out baskets, because you can't lean over a pipe
With plumbing in the way you can't kneel and reach to the back. Baskets that slide toward you turn the rear of a deep cabinet back into storage instead of a graveyard.
What we'd use
The SinkFlex 2-Tier Pull-Out Under Sink Organizer ($33 for a 2-pack) checks all three: height-adjustable shelves to clear the trap, two separate units so you can straddle the pipe instead of fighting it, and slide-out baskets for reach. If pot lids and tall bottles are the specific problem, the Adjustable Pot & Lid Organizer ($30) adjusts around pipes the same way and stores lids on edge.
What to avoid
Skip solid-top single-piece racks, anything that needs mounting to the cabinet wall, and any setup that buries the shut-off valves. Leave the trap visible — a slow leak you can see is a cheap repair, and one you can't is not.
Load it in the right order
Put the heaviest items on the cabinet floor beside the plumbing, not on a shelf sitting over it. Detergent jugs and buckets belong low; sponges, cloths, and small bottles go up on the tiers. Load a rack top-heavy above a pipe and one bump is all it takes to knock a shelf onto the trap joint.
Ready to fit your pipe cabinet? Shop the SinkFlex Pull-Out Organizer or read how to organize around the P-trap.