$140, Trivillage.com

*Best in Class*
The draw: Pockets for everything

This is a double-duty bag—in addition to padded backpack straps, it also offers the option to switch to a single-strap duffle bag for training days. The bag has a pocket for everything in its 70 liters of space—from the protective zippered helmet compartment on top to the waterproof wetsuit compartment on bottom, to a lockable felt-lined pocket for your ID, keys and phone. The duffel-style opening and high-contrast lime green interior allow you to easily see all your gear in the main compartment at once.

$180, Trivillage.com

The draw: Separate gear by sport

Inspired by hiking backpacks, this bag features a sturdy metal frame construction as well as a padded waist buckle to help distribute weight. Maxing out at 75 liters, this rugged pack features a front webbing helmet compartment, and its slim profile can slide under your bike when it’s racked to keep it from bugging your competitors in transition. Internal mesh dividers keep your swim, bike and run gear separate. In lieu of a wetsuit compartment, it features a removable mesh bag to clip to an attached carabiner to let your wetsuit drain. The main toolbox-style opening is clever but requires a lot of unbuckling to fully open.

$100, Blueseventy.com

The draw: Classic design

Blueseventy has sold iterations of this top-loading, 32-liter capacity bag for a decade. Its continued success comes from its classic, purposeful design. Every pocket, zipper and strap fulfills a need for triathletes. It features mesh external pockets for water bottles, a felt-lined pocket on top for sunglasses or goggles, a spacious waterproof wetsuit compartment, and multiple internal zippered pockets to keep your nutrition organized. Waist and chest straps help distribute the weight of a full pack, plus it works as an airline carry-on. It doesn’t technically have a helmet compartment, but even a long-tailed aero helmet can fit in the front partial mesh pocket.

$80, Amazon.com

The draw: Compact construction

Thanks to the flat bottom and firm construction of this slick-looking 30-liter bag, it stands up by itself, even when empty. The bag and shoulder straps are both cushioned and ventilated, so it’s comfy to carry when loaded. Our favorite features are the pocket against your back to protect important documents and your ID, Velcro straps to fit a full-size bike pump, and reflective piping and logos to improve visibility. There are no built-in compartments for a helmet or a wetsuit, but it does have two removable bags—one mesh, one waterproof—that act as de facto pockets.

– Transition bag reviews by Bethany Mavis