Waterproof Frame Cross Bag in Two Sizes
600D nylon welded shut in a 125 gram and a 90 gram size
What It Is and Who It Is For
A top tube cross bag in 600D nylon with a TPU waterproof membrane and a PP board interlayer, closed with a waterproof one-way zip and fixed with hook-and-loop straps. High-frequency welding replaces sewing so the bag stays sealed. The large size is 23.5 by 6.5 by 10.5 cm at 125 grams; the small is 21.5 by 5.5 by 8.5 cm at 90 grams.
Why Buyers Choose This Part
Two sizes from one design
125 grams at 23.5 cm and 90 grams at 21.5 cm, which covers small and large frames from the same tooling.
Welded and zipped waterproof
TPU membrane, welded seams and a waterproof one-way zip. All three have to be right or the bag leaks.
PP board interlayer
Keeps the bag in shape so it does not collapse onto the top tube when half empty.
Problems It Solves
- A top tube bag that leaks ruins a phone, not just a snack
- One size never suits both a small frame and a large one
- Sewn top tube bags sag once the stitching stretches
Who It Is For
- Road and gravel riders who want food within reach
- Brands offering a two-size top tube bag
- Online sellers who need a size option to raise average order value
Application Scenarios
- Road, gravel and commuting use
- Carrying a phone, keys and food within reach
- Brands needing a size-graded top tube bag
Technical Features
- 600D nylon with TPU membrane
- PP board interlayer
- Waterproof one-way zip
- Hook-and-loop frame straps
- High-frequency welded seams
- Large 125 g and small 90 g
Published Specification
| Material | 600D nylon + waterproof TPU membrane |
|---|---|
| Interlayer | PP board |
| Fastening | Hook-and-loop fastener |
| Zip | Waterproof one-way zip |
| Size large | 23.5 x 6.5 x 10.5 cm, 125 g |
| Size small | 21.5 x 5.5 x 8.5 cm, 90 g |
| Craft | High frequency welding |
Every figure in this table is transcribed from the VALORIDER catalogue specification for this product. Nothing has been estimated.
Product Views
Compared With the Alternatives
Lighter fabric than the 840D tail bag, because a top tube bag takes rain rather than direct wheel spray. Against the Waterproof Triangle Bag it holds less but sits within easy reach of the hands.
Customisation and Manufacturing
Welded bags are built on the high-frequency welding line, where the branding has to be applied without breaking the seal. That usually means a welded or heat transferred mark rather than stitching, because a stitched label would put needle holes back into a bag built to avoid them.
- Welded or heat transferred branding, never stitched through the membrane
- Fabric denier and membrane specified per panel
- Reflective placement set at sampling
- Polybag or colour box packing
Fitting and Living With It
Step 1
Choose the small size for compact frames where the bag would otherwise foul the knees.
Step 2
Strap around the top tube and head tube, tight enough that the bag does not rock.
Step 3
Close the one-way zip fully to the end stop, or the seal is not complete.
Step 4
Check that the straps clear your cables before tightening.
Others in This Part of the Catalogue
Bicycle Waterproof Tail Bag 840D Nylon with Welded Seams
High-frequency welded 840D nylon that is sealed rather than water resistant
View specification
Waterproof Triangle Frame Bag with Graded Fabrics
600D outside 420D inside 840D on the bottom where it matters
View specification
Waterproof Bike Pannier 27 L with Quick Release Clip System
27 litres on a clip system that attaches and detaches in seconds
View specification
Bicycle Phone Holder Bag with Rotating Base and Headphone Port
A 360 degree base a sunshade and somewhere to put your passport
View specificationGuides That Cover This Product
Why a Sewn Bike Bag Is Not Waterproof and a Welded One Is
Every stitch in a seam is a hole. High frequency welding removes them. Here is how to tell the two...
Read the guideDenier Explained 210D 420D 600D and 840D in Bike Luggage
Four numbers cover almost all bicycle luggage fabric. Here is what each one is for and why a good bag uses...
Read the guideWaterproof Frame Cross Bag in Two Sizes Questions
Which size should I buy?
Does the zip leak?
Will it rub the frame paint?
Can both sizes be ordered on the same purchase order?
Quote Waterproof Frame Cross Bag in Two Sizes
Send the quantity, the destination port and any branding requirement. We will come back with the questions that decide the price.