Photo by Solvit

Best suited for: Bike carrier
Also works for: Over the shoulder carrier
Quality: ★★★★★
Price: $$$$
Overall rating: ★★★★★

Solvit’s Deluxe Tagalong Pet Bicycle Basket can be unclipped from your bicycle’s bracket and, with the shoulder strap attached, also function as an over the shoulder carrier for your dog. The interior measurements are 10.5Hx13.5Lx10W, so it’s meant for toy breeds. Other nice features? It has an optional sunshade, a water bottle holder, a leash clip, and several useful pockets. This is a nicely-made product and was reviewed favorably in the Bike Commuters blog (but be sure to read the comment that talks about paint abrasion).

Amazon link:
Solvit Deluxe Tagalong Pet Bicycle Basket