The Complete Bouldering Gym Bag Checklist (What's Actually in Mine)
I've packed a bouldering gym bag roughly a thousand times, and I still remember every session I showed up without something: the no-brush day (grease-fest), the no-tape day (flapper, session over), the no-snack day (bonked at problem four). This checklist is the result of all of those. Steal it.
The 10-second version
A boulderer's gym bag needs five non-negotiables — climbing shoes, chalk, brush, tape, water — plus a skin kit, one warm layer, and something to carry it all that doesn't leak chalk over everything else. That's it. Everything beyond that is comfort, and comfort is fine, but weight you carry every day should earn its place.
Tier 1 — the non-negotiables
- Climbing shoes. Obvious, and yet: keep them in the bag permanently. The only way to never forget shoes is to never unpack them.
- Chalk — more than you think. A session's worth is the minimum; a week's worth is smarter. I keep my whole supply in a chalk bucket rather than a waist bag so the reserve travels with me and refills happen at zero cost.
- Brush. Greasy holds are the tax everyone pays when nobody brushes. Boar or nylon bristles, and store it upright where you can grab it between attempts.
- Finger tape. Not for prevention — for the moment a flapper decides whether your session continues or ends.
- Water bottle. The gym sells $4 water precisely because people forget this.
Tier 2 — the skin kit
Bouldering is a skin sport that occasionally involves climbing. A pouch the size of your fist covers all of it:
- Sanding block or file — flatten calluses before they become flappers
- Nail clippers — long nails and crimps do not coexist
- Climbing balm — rebuild skin overnight, climb again tomorrow
- A couple of band-aids — for the split tip that shows up anyway
Tier 3 — comfort that earns its weight
- One warm layer (hoodie or puffy) — gyms run hot, parking lots don't. Doubles as a pillow between burns.
- Snack — something dense. The difference between a 90-minute session and a 3-hour one is usually 300 calories.
- Headphones — for the projecting headspace.
- Deodorant + spare tee — if you go anywhere after. Your coworkers will not tell you; I will.
What NOT to pack
The stuff that never earns its spot: a second pair of shoes "just in case" (you'll never swap), a full-size towel (a bandana does the job), your laptop (you will not answer emails between attempts, stop pretending), and a giant duffel to hold all of the above — because a bag you hate carrying is a bag that stays home. If you're weighing up what should carry this list instead, we put a boulder bag, a chalk bucket and a plain tote head to head in boulder bag vs chalk bucket vs tote.
The packing system: one bag, zero chalk dust
Here's the rule that changed my kit: chalk gets a sealed compartment, electronics get a padded one, and they never meet. Loose chalk in a shared main compartment is how phones end up looking like they survived an avalanche.
My setup is — full transparency, we build it — the CRACX Ascend: a dust-tight roll-top chalk bucket big enough to swallow this entire checklist. Shoes, chalk supply and brushes live inside; phone, keys and wallet ride in the padded front pouch; the hoodie lashes under the rear bungee when the inside is full. One carry, no dust, nothing forgotten — the same logic as keeping chalk from getting everywhere, applied to the whole bag.
How big a bag does this need?
Everything above adds up to roughly 6 to 7 litres of gear, which is why a small chalk bucket never quite works and a backpack is more than you want indoors. If your own list looks different, our chalk bucket size calculator tots up the litres and tells you which size bracket you land in.
The printable list
Non-negotiables: shoes · chalk (full supply) · brush · tape · water
Skin kit: sander · clippers · balm · band-aids
Comfort: warm layer · snack · headphones · spare tee + deo
Heading outside? Add: crash pad · approach shoes · headlamp — full breakdown in the gym-to-crag guide.
Quick answers
Do I need my own chalk at a climbing gym?
Yes. Most gyms don't provide it, shared chalk is a hygiene lottery, and rental chalk bags are where motivation goes to die. Bring your own; your skin will thank you.
What size bag do I need for bouldering?
Big enough for shoes + chalk supply + layer + skin kit — roughly 20–30 liters. Expandable (roll-top) beats fixed-size: big on heavy days, compressed on light ones.
Should I keep chalk in my gym bag?
Only if it's sealed. Loose chalk in an ordinary zipper bag will coat everything you own in fine white dust — the fix is a dust-tight roll-top closure.
Written by a co-founder of CRACX — two climbers, no faces, one ideal. No fluff, just what works at the wall.
Cover photo : Nathan Cima / Unsplash. Graphics by CRACX.